The MemeBox has been significantly improved. It is now organized like an email inbox, which should make it a lot easier to manage lots of memes. The "P" stands for private. It means that the message in question was sent to you in private (ie, not posted to a thread or memestream).

I am using frames for this, and this is a "correct" use of frames. However, I'm not sure how well this is going to play with various browsers, so please let me know if you have any trouble.