| There are so many different non-MB options that it would be difficult mention anything specifically. All the big names have those, and they should mostly work with other phone brands too.
Considering the Treo, I think you would find answers from the Audio & Telematics forum. Haven't used Treo myself but I think it should work with the MB BT puck but downloading the phone book is an issue for some phone models (you can still use the phone book from the phone itself). | 
