How to cut and split mp3 files?

I know my phone can play normal mp3 and has enough memory to hold plenty of songs. So this in not the reason why you would want to split mp3 files for your phone. The reason is, that I want to set a certain mp3 as my ringtone. And I want only the favourite part of the song to be a ringtone, not the beginning etc...

So how do I split my mp3?

Crap. I tried and search the net for a mp3 splitter cutter whatever and all seem like crap and are not free. I can understand that people that program want something in return. I just feel there is an open source alternative to this that I just can't find?

I'll use a trial version, it's just one song, but if you have any ideas for a cool little mp3 cutter let me know. Or if I find out about one I'll post it...probably on my technology blog, when I think about it this is why I opened it, why am I writing this here...