If you search teh forums you'll see that this is a recurring problem for some people. If your IP comes from a block from which we get a lot of spam, you may well be spammed. If you post links, it ups the chances of getting put in spam. The solution is to comment on your own blog and then go in and de-spam yourself under Akismet Spam.
This seems to happen every time we get a wave of spam getting through; they tighten the controls and sometimes legit people get put into spam. You can teach it not to spam you, though, if you un-spam yourself.
And for your friends who are getting put into spam, you can retrieve their comments now that we have a Search box for the Akismet spam page. Type their name into the search box and if they've made any comments that got put into spam they should show up and you can de-spam them without having to sift through all the spam.