It looks like the Captivate is the next domino to fall, much as expected: AT&T just confirmed via twitter that the Froyo update is now available for Captivate owners through Kies Mini. Similarly, that support page we stumbled upon last week before being pulled has gone back up, and it looks just like it did then.
Obviously as the update is done through Kies Mini, you'll need that to start. Once you've got Kies all ready to go, you need to do a minor amount of jiggering to get the update installed. Not quite as easy as most OTAs, but nothing too strenuous either.
For full details/instructions, hit up the support page below.