EBay recently launched blogs for it’s members as a supplement to its very active forum community. While message boards are useful for loosely classified conversations where anyone can start a thread, blogs are better suited for individuals who want to project a voice around an area of expertise. We’re already seeing examples of this as members share their knowledge of things such as eBay-specific HTML tags.
Now eBay has added a wiki (powered by JotSpot) to the community area and one hopes that it will become an excellent source of hyper-detailed, domain-specific knowledge about collectibles. Where else (outside the rarified world of Yahoo Groups) can you find a detailed discussion of the net worth of a bag of trolls?
Richard MacManus has a detailed writeup.