My 12" PB came with BT, its great. I use it with my phone. I can put mp4, mp3 files on my phone with it, and listen to them through a headset, or use my songs as ringtones. I can also connect through the net through it using it as a modem, at near broadband speeds because of Cingulars EDGE network. I also send videos to my phone, and use it as a sort of temporary memory drive. Sync contacts, all kinda stuff. I also have a BT mouse and keyboard, works great. The PB doesn't have enough USB ports, and the BT really frees them up.