When considering the league's most attractive expiring contracts, there are a few different factors that come into play.
First and foremost, the team in current possession of an expiring contract has to be looking for a long-term player as opposed to the cap space that would come by letting the player's deal come off the books.
So the Utah Jazz, for example, have no real use for the expiring deals of Andris Biedrins, Marvin Williams and Richard Jefferson in a trade because they're rebuilding and almost certainly would rather have cap space then the flotsam those pieces would bring back.
Other teams, like the Los Angeles Lakers, that want to make a big splash in free agency are unlikely to move a deal like Pau Gasol's. Ditto for teams running up against or already in the luxury tax, like the Indiana Pacers with Danny Granger and the Chicago Bulls with Luol Deng.
We'll also be leaving out players who are restricted free agents (like Greg Monroe), as this is just for the true expiring deals.
Other factors considered are the size of the contract (the bigger the better) and the actual production of the player.
The following ranking of expiring contracts that could be dealt this year is sponsored by Detroit Pistons general manager Joe Dumars and his disastrous free-agency signings. Enjoy.