Disclaimer: You could brick your phone and/or void your warranty. What you read here and then attempt to do is at your own risk. I am not responsible for what you do with your phone, PC, Mac, or whatever else you are messing around with. Proceed at your own risk.

I received a replacement MT3G after successfully rooting, then subsequently bricking my phone attempting to install an incompatible ROM that updated the SPL. Rooters beware. Below is how I rooted my replacement phone that came with stock Android 1.6 build DRC92 and the perfect SPL 1.33.0007. The combination isnt bad to root IF you have the correct files and a Goldcard.

1. Download and save the file 2.53.707.2_-_sappimg.zip from http://rapidshare.com/files/267446145/2.53.707.2_-_sappimg.zip
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   • Discussion thread: http://forum.xda-developers.com/showthread.php?t=548218
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2. Power down your phone
3. Remove the back panel
4. Remove the SD card
5. Insert the SD card into your PC
6. Copy the zip file to the root of your SD card, no folder
7. Rename the file to "sappimg.zip" if it isn’t already, be sure that it isnt "sappimg.nbh.nbh"
8. Put the SD card into your phone
9. Enter "FASTBOOT Mode" on your phone by holding the Volume Down and Power buttons (you can also use the Back and Power buttons) 
   • The screen will turn white with three little green robots on the bottom
10. Click the trackball and wait for it to pick up the "sappimg.zip" file
    • It may be necessary to press the down volume button, followed by the back button
11. Click the trackball again to begin, it should automatically update from there
    • If you do not get "Update Complete!" you will need to build a Goldcard and try again: Here is how to create a Goldcard – http://thatsbadass.com/android/2010/02/08/goldcard-build/
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12. Once complete, reboot the phone