Actually, the Register reported that a Google spokeswoman told them that it has no plans to sell any domains at the moment. According to the article, the reason it paid a $2,500 application fee and $6,500 to cover six top-level domains is that it "wants to get a better understanding of the domain name system [and so] increase the quality of our search results". The article goes on to note that "...Amazon did exactly the same thing nearly two years ago. At that time, a March 2003 article in the Wall Street Journal pointed out that the online giant had become a registrar and assumed that it was about to launch a domain name selling business. It set the industry off - but we are still waiting, 47 months later."
You can find the full text here:
http://www.theregister.co.uk/2005/02...domain_seller/