You've almost certainly seen their advertisements through Marvel comics recently, but just in case you haven't, the guys at Comics Collector Live want you to know that they have a free comic management application you can download and run on your computer.
It looks like the software hooks you up to their central online database, and you can see what comics other people have to buy and sell - and presumably find out what comics are popular. Sounds like an excellent idea to me. They have over 30,000 members signed up so far, which is pretty good going.
Now they just need to hook it into the Marvel Previews, Diamond Comics Distributors and the Postal Service, and you need never leave the house again!