How long have you been waiting for this? The wait is over, a CyanogenMod 7 official test release is now available for you Vibrant owners. The build is clearly labeled test release so don’t expect a *completely* stable experience, but you can help find bugs and issues so the next release is that much better. The Vibrant will probably never get an official Gingerbread update, now you don’t have to worry about that. You can obtain more information and a download link from CyanogenMod Forums.
Source: Android Central