Purchasing an existing domain or website can be a great way to provide a spark to your online business. I am always on the lookout for some interesting new properties. This can take a lot of time because there are a number of places where people post their domains or sites for sale. Shoemoney recently created a page that aggregates many of these sites into one source. At his marketplace you can even get an RSS feed of all of the listings. The feed has been a great addition to my bloglines account and it has already helped me to quickly pick up a few properties.

The only feature missing would be some search functionality to quickly be able to search the feed. It is a huge timesaver, and I highly recommend adding it to you feedreader.