Sure, there are numerous adapters that plug into the iPod's dock connector to give you wireless music, but they are clunky, they come off easily, can't use them with your case and you have to charge them separately!
So, here is my way to add "native" internal Bluetooth support to your 4G iPod. The same method may be used with other iPod versions, I leave that up to you.
You can also check out my new Bluetooth 5G iPod Video at iPodHackers.net
Required: A steady hand and decent soldering skills.
Oh, and you must be willing to live with the possibility that you will destroy your iPod. I'm not responsible if you screw up and burn up your iPod!
NOTE: I am currently selling this iPod on eBay (item 290199085046) so if you don't feel like doing your own, you can buy this one!
Step 1: What You Need
A few lengths of hook-up wire
Xacto knife or razor blade
4G 20GB iPod
40GB/60GB iPod metal casing (optional)
Jabra A120S Bluetooth Music Adapter**
Bluetooth stereo headphones (A2DP compatible)
** make sure to pair the adapter to your headphones prior to starting this project, it will make testing much easier in the end**
Note: I am using a 20GB iPod which I have already converted to use Flash memory (see my instructable on how to do this). Removing the original 20GB drive gives me enough room to install the Bluetooth circuit board. If you want to keep your hard drive, you might want to procure a 40GB or 60GB backing for your iPod so that you have enough room.