I consider the best way is to use SoundTaxi - I tested another rm-converters, but they are slowler and sound quality becomes worse :cry:
SoundTaxi allows 12-15x speed and perfect sound quality!
Regards!
(my favorit tool)
Try SoundTaxi - it's a nice one converting tool, which helps to crack media protection... so you'll be able to use your iPod without any limits!
Cheers :)