If you haven't been there already, The Hero Factory is located here: http://www.cpbintegrated.com/theherofactory/
It's a site where you can build your own superhero. It's slightly limited, and you can't choose the names, but it's a lot of fun!
Diana Peterfreund is having a contest for 3 copies of Dull Boy by Sarah Cross, and making heroes on the site gets you extra entries. The winners will be chosen later today (Monday)! - http://www.dianapeterfreund.com/dull-boy-giveaway/
EDIT: There's also another contest for Dull Boy here (deadline 6/6 at midnight PST): http://vvb32reads.blogspot.com/2009/05/dull-boy-giveaway.html
Here are some I made:
Here are some links to other superhero builders:
10 Year Celebration and a Fond Farewell
3 weeks ago