Edgeio and Craigslist
Jeff Jarvis posted a long and thoughtful post about Edgeio and what happens when anyone can post a classified ad on their blog or anywhere else and it gets picked up in a centralized marketplace (Edgeio, Cragislist, Indeed, etc).
It's worth reading if you are interested in the future of classifieds.
But even more interesting are the comments from Craig Newmark, Dave McClure of Simply Hired, and Keath Teare, CEO of Edgeio.
I love when the conversations that used to happen behind closed doors happen out in the open for everyone to observe and participate in.