An acronym for "Search Engine for Domain Offers," Sedo is one of the leading online domain aftermarketplaces, with the world's largest database of domain names (over 8 million domains listed for sale).

When Sedo.com acquired GreatDomains in June (for a reported $2 million) to boost their presence in the higher end of the domain market, they kicked off a monthly week-long online live auction of premium domains.   The most recent auction, ending August 23, sold 22 domains, including lifts.com (67,000), dental.net and queries.com (both $21,500).

According to Zetetic's December 2005 data, Sedo had the highest average sale price of the major online exchanges, and I bet the premium auction has further boosted this.

For a quick summary of Sedo's process and fees (as well as comparison with Afternic), see this Domains Magazine article about Selling Domains: Domain Aftermarkets.