[Vibrant Android Development] kaintfm:
Link to a guide on how to root, use recovery, flash, and many other tips and tricks.

http://xdaforums.com/showthread.php?t=732458

3 links to instructions on how to enter download mode and return to stock:

http://xdaforums.com/showthread.php?t=734475

http://xdaforums.com/showthread.php?p=13132341#post13132341

http://rootzwiki.com/topic/605-guid...pps-everything/page__view__findpost__p__11106

Link to the latest Samsung drivers for Mobile Phones:

http://www.mediafire.com/?1c3ca4117bm43n6

2 links to the JFD tar image for the Samsung Vibrant. Only one is needed:

http://files.androidspin.com/downloads.php?dir=androidspin/samsung/vibrant/&file=T959UVJFD.tar

http://sourceforge.net/projects/stockodinjfd/files/T959UVJFD.tar/download

2 links to the PIT file to be used when flashing Stock JFD for the Samsung Vibrant. Only one is needed:

http://files.androidspin.com/downlo...in/samsung/vibrant/&file=s1_odin_20100512.rar

http://sourceforge.net/projects/stockodinjfd/files/s1_odin_20100512.pit/download

Latest Odin version available below in 7zip and zip formats. Also linked here:

http://sourceforge.net/projects/stockodinjfd/files/Odin3 v1.7.exe/download

How To Enter Download Mode.

There are a number of ways to enter download mode, such as clicking "Enter Download Mode" in a compatible recovery, or clicking "Download Mode" in a long-press power button menu in your custom ROM. If you do not have access to those methods, the most surefire way I know of entering download mode is this:

1) If not already powered down, power down your phone.

2) Remove the back cover.

3) Remove the battery.

4) Plug your micro USB cable into your computer (Your computer should be on at this time.)

5) (This will take a little dexterity. Enlist help if it proves too difficult on your own.) Hold down both volume keys at the same time.

6) While still holding down the two volume keys, insert your micro usb cable into your phone.

7) While still holding down the two volume keys, insert the battery into your phone.

8) Your screen should now light up with a yellow digging Android that reads "Download Mode"

9) If you did not reach download mode, repeat steps 1 - 7 several times to rule out any user error.

10) If you still cannot enter download mode, remove your SD card and SIM card as well as your battery. Do not re-insert the SD or SIM card when you re-insert your battery in step 7.

11) If you still cannot enter download mode, remove your battery, SD, and SIM card. Wait 24hrs and try again.

12) If you still cannot enter download mode, your phone may require special care, such as a JIG or JTAG. Information on this can be found elsewhere on the XDA forums.

Alternate, similar method for entering Download Mode (thanks to Br1cK'd)

1) Power down your phone and remove the battery.

2) Re-insert the battery. (but do not turn on your phone)

3) Plug the micro USB cable into your computer.

4) Press and hold down both volume keys.

5) While still holding down both volume keys, plug the other end of the micro USB cable into your phone.

6) Your screen should now light up with a yellow digging Android that reads "Download Mode".

7) If you are still unable to get into download mode, follow steps 9 - 12 of the previous method.

If any of my information is incorrect, please let me know and I'll amend the OP to reflect the correct information.

I did not come up with any of this information on my own apart from searching for it in the first place. If you are one of the pioneers of these methods or files, you have my thanks. If your post or file is one of the ones I've linked to, you also have my thanks and gratitude.