I am selling another website via Flippa (formerly SitePoint marketplace). Although it costs $19 for a basic listing and much more to give it exposure, it is by far the best place to list a website or domain for sale and you get a much better response than listing a site on a forum.
I am selling my Twitter blog Time To Tweet. In my last sale I chose 2-3 weeks as the end date and used a buy it now. This time I decided to end the auction within 4 days, remove the buy it now and pay an extra $30 to display the blog for sale on the home page. Within a few hours it has already had 4 or 5 bids so I shouldn’t have any problems selling it.
I am also selling Mixa.org, a great little 4 letter domain name which I picked up in an expiring domain auction last year. I’m sure it would prove to be a great domain name for a music related website. I have a dozen or so 3 or 4 letter domains so it will be interesting to see if Flippa attracts domain traders as well as website traders.

It appears the new Flippa marketplace is starting to take off. I just went there and was a little surprised to discover that only 35-percent of their listings are actually sold. That seems a lower than what I expected.
Yeah though I think you need to take into account of all the poor sites which are being sold there too which push the average down. Most decent websites which are listed with realistic prices get bids.