Marc's note: In an effort to help advertisers Google has released a list of their top 1000 sites world wide. The list ranks sites based on category, unique visitors, reach and page views. NASA comes in ranked 604. Interestingly Goddard's web site came out tops for NASA subdomains with JPL a distant second. No other dedicated space site made the list including SpaceRef and NASA Watch, surprisingly ;-)
Based on this ranking if NASA decided to allow some advertising on their sites they would be able to cash in on part of the $6.3 billion revenue advertisers spend on internet sites in 2009. In fact they might even be able to fund a Scout or Discovery Class mission each year or better yet start a major scholarship fund and replenish their workforce with new engineers etc. each year.