However, Captivate owners can join the ranks now that a leaked build of Froyo is available for their amusement. Sure, you'll run some risks when installing this leaked build, but you do get to experience all of the wonders that Android 2.2 has to offer. If you can't wait any longer for AT&T to push out the official one, you can head on over to xda-developers and follow the simple instructions to get your handset up to par with Froyo.
As with almost anything, just remember some of the risks you place yourself in by choosing to be ahead of the curve.
Samsung Captivate Specifications | Review
source: xda-developers via Android Central