Capps will be gone, and probably Liriano too. If Pavano had been healthy and effective, I'd add him to the list, but I think his injury will cool interest, since he is a free agent at the end of the year - he probably can't add to a contender this year, so teams will wait to see how he bounces back and possibly offer him a contract after the year.
I think there will be offers for Span and Willingham, but I'm not certain what we will be offered in return will be enough to justify a trade.