Torrents for both official versions of Android 2.1 and 2.2, for the Samsung Captivate, have been added below and on Demonoid. These are the official versions posted by designgears in the xda developers forums. These are odin 1 clicks, so it can’t get any easier.

Android 2.1 (stock) for Samsung Captivate – Torrent
Android 2.1 (stock) xda developers forum – link

Android 2.2 (froyo) for Samsung Captivate – Torrent
Android 2.2 (froyo) xda developers forum - link

Thanks again to designgears and xda! -Greg