Apparently some dudes over at iBluetooth Project has posted up a source code which apparently activates bluetooth for the ipod touch 2G. It’s FULLY compatible with both the iPhone, and iPod Touch 2G actually. However, someone just needs to compile the code into an application. That’s why they released the source code cause they obviously don’t know how to compile it into an app.
The goal with this is to FULLY enable the use of the BT-chips inside the later iDevices. Figure an iPT2G, where you via BlueTooth connect your cellphone TO your device, makin’ it possible to text from it, make calls, receive calls, you name it! All this i theoretically possible. We just need the manpower to do it.
So far, no one has created this app yet, but the source code is all there for people to make one and distribute it to us. It’s been 3 days since the code’s release but no one has helped yet. If anyone who is experienced at making applications/GUI’s, please help out!
The thread can be found here
EDIT:

A few hours ago, I found a N45AP.plist which is able to add a new tab on your settings app “Bluetooth”. Just like above, in theory, it’s supposed to search for other mobile devices connected to bluetooth. However, this little modification fails to do that just yet.
You also need to do a few tricks to get this screen to at least stay on (because usually “Devices” tab only pops up for like 2 seconds and disappears). The Bluetooth icon in the status bar also remains after this although it isn’t blue, its clear which means nothing is going on. Anyway, you can do this by going to Settings>Nike+iPod, then turn Nike on and hold down the home button until you go to the springboard. You will notice that the bluetooth icon in the upper right hand corner of the screen on the status bar is there, now go in to bluetooth in General>Bluetooth and it should be active.
Now, if you go to your mobile phone that’s connected to bluetooth, scan for devices and you’ll see it say “Audio Device” found. However, that’s as far you can get with this. You cannot pair up unfortunately.
The folks at iBluetooth Project apparently has a bluetooth stack that is compatible with the ipt2g (read the top!); but someone needs to compile it as an app, which no one has been doing for the past few days.
Anyway, here’s the N45AP.plist which you can replace to your iPod and see what you can find!
Just Download OpenSSH from Cydia to SSH.
Download this file, here
SSH to your directory
Go on System/Library/CoreServices/SpringBoard.app/
And backup N45AP.plist for any case
Now, drag the modified N45AP.plist and press yes to replace.
respring and go to Settings>General>Bluetooth to see it appear!
Just follow the instructions above on how to keep the bluetooth on