I guess I'm a sucker for interactive pie charts and line graphs. I can't get enough of my mint.com account. It makes me want to open more accounts in more places just so I can track them!
Now I got in on their Inventment account beta, and they have support for my ira, and my 401k's sites, so I can watch expectantly for the day I stop losing money in the stock market :) So, if you like wasting time finding out how much you spent on gas this month versus last month (huh, spent $50 less in may than april, wierd), try out mint.com. Too bad financial information is so personal, it'd be great fun to get some social networking going on there.
I kinda feel bad though. They look at things like how much you've got on your cards and try and hook you up with better deals, which I assume they would get a commission on. I always check them out, but ugh, too much work for too little gain. Well, I'm sure I'll find a way to financially support them at some point. Heck, I might even pay a couple bucks a month for the service.