Two vague LJ related ideas...
I think it would be great if LJ supported wish lists. I guess that what that would mean would be a way to store a list of possible gifts, with or without links to sites that sell the stuff, which generous people could then claim/offer to buy. You would get an e-mail alert when someone claims an item so that you can decide whether to send them your postal address. Optionally you could list dates like birthdays, anniversaries, religious or secular holidays when you want gifts.
The claiming system would mean people wouldn't buy you things twice. Of course not being Amazon, LJ can't post things to your address, and can't guarantee that people who claim items will actually buy them. But does it sound useful? And how hard would it be to do? And if it can't be done on LJ is there anyone who could help me put such a thing on my own web pages? (I have a BM address, so I don't mind publicising it. In fact, here it is - anyone who wishes to send me gifts can send them to BM BOOG, London WC1N 3XX. I like tequila...)
Anyway. The other idea was about reports of events with a lot of LJers. Has there ever been a competition, or a page on LJ which list posts with the most lj-user tags. Stoopid idea, I know, 'cos people would cheat, but I know my post BiCon report is going to be awash with user names.