With so many services that provide paid ring tones for your cellphone, like Jamba in the picture - which actually had a kind of scam here in Portugal, but that's another subject I could talk for a while and maybe I will, but now now - It's rare to find these kind of services for free, so the best way is to do it yourself of course.

Wired has the perfect guide for this, but lets not forget that you're suppose have to own the CD or MP3 to do this.

It will only take about half an hour max, and you'll need some freeware programs like Audacity, and Lame Encoder

Read how to make your own ring tones - for free