I wanted to put this as OT but realized we all might use it for NBA games more then anything so I decided against it.
The site is still in beta so not everything works quite yet but it should be going out of beta pretty soon. SeatQuest allows you to type in a venue or event that you are interested it. It then goes out to find tickets still available in your price range or ones up on places like ebay. No mention of Craigslist or Stubhub yet but I think if they were to receive emails suggesting it, they would add it. Should save you some time ticket hunting or last minute grab for tickets.
http://beta.seatquest.com/Here are a few others that have flash based LIVE hunts for tickets as well
RazorGator.com
TicketsNow.com
According to the guy who runs SeatQuest these sites are not quite as good as theirs as they pull ticket sales from other places and you can get real specific on where you want to sit.