I've started using iTunes for Windows to rip CDs, and to buy one-off songs online. I'd sort of assumed that Apple had done a pretty complete job of ensuring that downloaded songs would remain within their DRM bubble, since they have limits on the computers they can be shared to and so on. So I was surprised to see how easy it is to buy a song online and turn it into an unencumbered MP3 file, and I was especially surprised that iTunes showed me the way.
I downloaded a song, and wanted to play it in the car, which has an old-fashioned CD player (only audio disks). So I put a blank CD-R in the burner, and used the burn button (I want more software with buttons like that one!). After burning, iTunes detected that the CD player now had an audio disk in it, and changed the burn button into an import button. That surprised me, but sure enough, clicking the import button ripped the audio CD into plain-old MP3 files.
So it's easy to get MP3's from the iTunes store, you just have to waste a CD-R to do it.