2+2 is what first got me interested in photoshopping and I've been looking for a while for something in addition to the NVG chop threads as they're fairly rare, but haven't been satisfied with anything I've found, until now.
This subreddit has been around for a few months but has really taken off in the past couple of weeks after being featured a few times on the front page of reddit.com. It's getting pretty huge and much of the quality is superb. It makes my technical abilities look even crumbier than 2+2 does but it's a great way to learn. They also host a weekly competition where the entries are voted on by members.
Anyway, I know there's a lot of photoshoppers on 2+2 so I wanted to share this link: http://www.reddit.com/r/photoshopbattles/
It's worth bring up the best threads by clicking on the "top" tab then filtering it for "all time". Some great pages to look through.