The 100 pushups, lots of memes and links - like the sort where if you click on something or play a game, you're creating a donation of some kind. The livelongnmarry auction - I contributed both money and items to that cause. Lots of recipes, from individuals and communities. I've read books because of repeated recommendations or mentions on my flist. I've tried wrock. I've read fics that appeared on my flist or were recommended, and been coaxed via LJ to sign up for fic fests. Watching a RPG inspired me to start playing in it.

Also, I really want to come to your May Day celebration because of the number of times you've described it and enjoyed it. :)