There are a lot of mods at XDA, and this one is for the Samsung Vibrant, courtesy of XDA forum member siirial.
If you fancy a front facing camera for your Vibrant, take a look at this mod – you’ll need a specifically compatible ROM for the front facing camera, the right kernel, a front facing camera (of course!) and be up for part dismantling your device.
The internal battery cover and Vibrant camera will need to be removed and cleaned out. The XDA member states that he used a metal flat head screw driver, however you should proceed with extreme caution.
For full instructions including compatible ROMS, kernels and where to source a front facing camera, head on over to the modification thread._________