I was bored and decided to come up with a little mod to give me something to do. So here it is: A universal Bluetooth headset mod for the PSP and PS2/ PS2 games on PS3.
With this mod I'm able to voice chat wirelessly on PSP games like the SOCOM FTB franchise using my Bluetooth headset. In addition to working with the PSP I can also use the same Bluetooth headset to voice chat wirelessly on any PS2.
In case you didn't know if you try to play say SOCOM: Combined Assault (a PS2 game) on the PS3 without this mod you cannot use a Bluetooth headset because the PS2 game is not coded to take advantage of the PS3's Bluetooth functionality, but with this now you can!
Note: I'm in the process of writing up step by step guide to build your own which I intend to release on the instructables site.