This topic on the T-Mobile Forum was very helpful indeed as I'd just bought a Polaroid Pogo from Bentham Ltd Amazon (Excellent service - bought it on the morning of the 23rd December 2009 and it came on the next day!). Basically one needs to download a shareware application from the market (The app is free but supported by advertising, go figure!) and it'll work like a charm. All I need now is for Audible to do a version of their software for Android and I'd be a Happy Bunny (Did try Santosh's method from Android Forums, but I failed miserably.).
QR code for Bluetooth File Transfer: