I Use This

Ok first site.

http://osx.iusethis.com/

I use this is one awesome site. You can create your profile and find apps you havn't heard of yet or show off apps you have.

You can have friends and once you start getting more into it the site will actually start recommending apps.

http://osx.iusethis.com/user/guitarjockey

That is my profile with my list of apps. So feel free to add me and if you have any more questions or you want to know more about it let me know and I'll update the post =)

UPDATE: I use this is alot like digg.com but for apps. Hope that helps.