Seems like alot of things rock for me today. This one--Craigslist--surely does.
When I was apartment-hunting in SB three months ago, I logged onto Craigslist hourly almost, to find the latest listings and to communicate by email with the owners. Really quick and efficient, an important feature being that when the space was rented, it was removed from Craigslist, unlike in the classifieds of the SB News-Press, where a rental could appear available long after it was rented. Other features, too, making Craigslist far superior to the newpaper for classified advertising. I'm certain that it, along with eBay and uBid (both of which I've used as well) are part of the problem the papers are facing, as shown in their declining revenues.
And now Craigslist is taking on the news component of newspapers. Right on, dog!