Your only choice for wireless at the moment is to get a bluetooth adapter first.
Several companies make them.
I've got the
Sony DR-BT50 headphones, and they sound great. I've just ordered the JBL Ref 610 headphones, and will review them for my blog when I get them (in a week or so).
You can find less expensice bluetooth headphones. The
Insignia's from Best Buy are easy to find, and on sale this week for $39ish.
Of course many will warn you that bluetooth means the sound will be degraded horribly. I find it is not, and the Sony's sound easily as good as my Sennheiser 595 wired headphones.
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