Kingdom of Loathing was this funny, weird, and fairly simple (in terms of interface) online game I played for a few months last year. Many of us from flickr/GNE really got into the game and spent a lot of time on it. We even had a clan of our own.
Then, quite as suddenly, many of us got bored with it. Some though, were still very into it. Notably Shambly Hermit. He kept playing and playing and eventually worked his way into the 1337 crowd. He is now a member of some warehouse whatever clan which apparently controls a lot of what happens in KoL.
Shambly also spends his time commissioning art and avatars for other KoL players. He also runs my two players on KoL. Shambly is the dog you never know is on the internet. (I bet his dog is online too!)