I propose this midseason trade.
Golden State receives:
Matt Bonner
Ime Udoka
Jacque Vaughn
Anthony Tolliver (or James Gist)
Their own 2008 2nd round pick (currently owned by Spurs)
San Antonio receives:
Stephen Jackson
Check the salaries (on realgm) - it works.
By midseason, Golden State will be at the bottom of the standings, ready to cut salary and make a run at the lottery. Stephen Jackson will most likely be seen as not helping the chemistry of the young team.
Spurs step in, offer up some expiring contracts and a pick, and voila, you've got a trade.
BTW, Jackson's contract is up the summer of '10 - the Spurs get the ballsy scorer they've been missing for quite some time now along with the contract they want.