You can create a blogroll in your dashboard links section and use the Links widget to display it. http://en.support.wordpress.com/blogroll/add-a-blogroll-link/
Will you please read my answer here to you on your categories question posted into another thread? http://en.forums.wordpress.com/topic/how-to-add-actual-categories-to-my-category-widget?replies=2
Provided the content is not of a mature adult NSFW nature, will you also link your username to your blog so we don't have to make you wait while we hunt for it? It’s very easy to do. Here’s how to link your username to your blog in your blog Dashboard -> Users -> Personal Settings -> then scroll down to Account Details. Then scroll down to where it says ‘Primary Blog‘ select the URL for your primary wordpress.com blog and then save changes.
Then every time you sign into the forum we can all click on your username and your blog will be linked to it. And every time you leave a comment on a blog your username can be likewise clicked and your blog can be instantly located.
Last but not least, here two very helpful links:
on the bottom of your Admin page you will find a link to the Learn WordPress.com blogging Tutorial prepared by Staff. http://learn.wordpress.com/
The support documentation is all found at the Support link http://en.support.wordpress.com which is also on the bottom of your Admin page.