Put it on Ebay. Set a pretty high reserve and run it for 7 days. Since your bike is only worth what someone is willing to pay, this should give you the most visibility.

Good Luck.

The bike is a 2004 Felt S22, I have not upgraded anything on it. It is in good shape, routine maintence has been done, never crashed.

A quick search of ebay shows recent sales of similar bikes ... a 52cm 2002 sold for $650, and a 54cm 2005 sold for $950. But as McTri stated its only worth what someone will pay at the moment. I don't like the idea of setting a high reserve ... people don't bid as well when the item says "reserve not met" they think you have unreasonable expectations. List it with no reserve, make sure that you include lots of sharp pictures of it (including any flaws) and give an accurate description, and you will get a fair price.

According to ebay, the Felt S22 ranges from 0 - $1525 with an average price of $1076.85 but it does not state what the years are of those bikes. I did a search and found 2006 and 2007 bikes. This one closes in a couple of hours and might give you some indication of what a new version will go for.

http://cgi.ebay.com/2006-FELT-S22-TT-TRIATHLON-BIKE-MINT-CONDITION_W0QQitemZ230276511432QQihZ013QQcategoryZ2918QQssPageNameZWDVWQQrdZ1QQcmdZViewItem