I highly doubt Spurs will take Jamison's contract without trading away RJ's contract. If Wizards can't trade Jamison for expiring contracts, they could settle for a player with a contract that expire in 2011 like RJ.
A nice little trade scenario for Spurs:
Spurs:
out: Jefferson, Mason, Finley, Bonner, Mahinmi, 2010 first round pick.
in: Jamison, Salmons, Miller.
Wizards:
out: Jamison, Miller.
in: Jefferson, Bonner, Mahinmi, Spurs 2010 first round pick.
Bulls:
out: Salmons.
in: Mason, Finley.
Wizards go under the tax, get a contract one year shorter for Jamison and have a pick to start the rebuilding process.
Bulls creates more 2010 cap space.