but the title/subject of the email was [Travels with My Camera] Please moderate: "THE VIEW FROM THE SHARD - London's Newest Viewing Attraction.

What does Please moderate mean and is this a message from Word Press?

Note that you have complete control comment moderation. http://en.support.wordpress.com/settings/discussion-settings/#comment-moderation If your blog is public others can, of course, read it. They can submit comments but you can Moderate all comments and choose which ones to approve or not.

For trolls, you can “blacklist” them at Settings > Discussion toward the bottom of that page. Enter their email address, their username, and if they included it, their website. That will automatically send them to moderation so that their comments do not appear on the blog.

Do note though that if they are determined, they can use a different email address or username to get around that as ardpete said.

Also, do not put their IP address in the blacklist. IP addresses are no longer unique, and you might end up blocking legitimate visitors. Also, all they would have to do is go to a wi-fi hot spot, or connect via a different ISP and they could get around that.
http://en.support.wordpress.com/settings/discussion-settings/
http://en.support.wordpress.com/settings/discussion-settings/#comment-blacklist

I suggest is to set your blog so that first time commenters are held in moderation till approved, then from that point forward they will not need approval. Settings > Discussion. The next step on that of course is to set it so that all comments are held in moderation until approved. That way you are in control, and they might just get tired and go elsewhere after a while.

Trust me, we've been through the peer group pressure AND some of the fallout!

Clicking with Caution is a series of educational videos by kids and for kids, and aimed at to raising awareness of internet risks and teaching preventive measures. Topics included are : Maintaining Anonymity, Cyber Bullying, Online Sexual Predators and Online Gaming. The Clicking with Caution series was made in collaboration with the NYC Dept of Education’s Office of Instructional (now Educational) Technology and the Mayor’s office in partnership with Reel Works Teen Filmmaking and Microsoft. Watch Clicking with Caution here.

I don't think it is technology at fault, it is parents and society.

Agreed and while I'm okay with our policing budgets being increased to apprehend cyber criminals and bring them to the courts, I'm not so naive as to believe that if parents don't act that there will not be more victims. Technologically addicted parents who cop out of parenting are creating a generation of cyber-hooked kids who are defining themselves and their self esteem in places like faceplant. Technologically addicted women are even starting faceplant accounts for their fetusues. No, I am not kidding!

Why? I don't think it is technology at fault, it is parents and society.

As for mentally disturbed people, dare I suggest that our very own Apostle Jack falls into that category? Contributed to a couple of good posts for me though...

Myself, I have no stated comment policy for my blog - frankly, I consider myself God-Emperor (to borrow from Frank Herbert) of my blog and all comments exist at my pleasure (smile - though I've yet to not approve one)

What are your thoughts on these people?

There are three reasons why people troll blogs, chatrooms, newsgroups and social networking sites. They are:
to get attention;
to disrupt;
to make trouble.
They get no gratification at all when the are ignored as what they aim to do is provoke emotional responses. Trolls have no true interest in the subjects they post on, their aim is only a childish and narcissistic one and that is to secure attention through the manifestation of negative behavior. What trolls desire is our online time and attention. When we refuse to respond to their posts or waste our time fruitlessly communicating with them, they move elsewhere.

In addition there isn't a country on this planet that does not have mentally disturbed people. There are many who suffer from an array of illnesses and disorders and we experience them both online and offline.

And how are they being dealt with in other countries?

Search the news for various countries and you will find your answer.

The number of children reporting online harassment has gone up by 50 percent since 2000. (Source: Centers for Disease Control and Prevention). The reality we face is that technology has provided a means of harassing others that didn't exist before. Our policing budgets none include large allocations of funding directed at locating cyber-criminals and bringing them before the courts.

IMHO what's also needed is a reality check and much more parental guidance for kids who are virtually living their lives online and who are sucked into becoming the victims of trolls. Many parents found the boob tube to be a great babysitter and that evolved into giving little kids computers, cell phones, laptops, etc. to keep them busy.

These days we all know that technological addiction exists and kids are deriving their concept of who they are in the world from their online encounters. Kids need face-t-face relationships with healthy role models and peers. They need fresh air and exercise and so do their parents. They also need supervision they aren't getting when they are online.

Worse stil, many parents are themselves addicted to technology and are not capable of functioning as healthy role models at all. There are many latch key kids who have parents who bring their work home with them and then spend hours online modeling that to them. Parents who are a part of the always switched on legions of cyber addicts out there are creating little images of themselves. Those little images are needy and neglected. They are prefect targets for cyberbullies and trolls.

We are all responsible for our own emotional health. It takes just as much energy to take offense as it does to give offense. There is no logic when it comes to wasting your energy on trolls. Clearly your blog is not YOU and my blog is no ME. The commentator cannot touch our inner self, unless we give them permission to so don’t open that inner door and give your power away. Take responsibility, develop a comment policy and either post the comment and refute the contents or delete it and blog on.

My advice is to all bloggers is to moderate comments and develop a comment policy for your blog and enforce it including:
1. On topic comments are welcome and encouraged;
2. Comments ought to add value;
3. Keywords in the “name” field are spam;
4. Links must be relevant;
5. No signature links in comments, as usernames are already links to sites/blogs.