More just a heads up than anything else. If you're spending money downloading MP3s from iTunes, you may want to give Amazon MP3 downloads a serious look. Amazon MP3s are generally cheaper, and you can find some outstanding deals there. Take, for example, $3.99 for The Pogues' If I Should Fall from Grace, or $1.99 for John Coltrane's Blue Train. (Both deals were mentioned over at Largehearted Boy.) For more cheap music on Amazon, visit this page. And find 500 free songs here, although caveat emptor, these may be geo-restricted.
It's worth mentioning that Amazon MP3s are all DRM-free (that's not the case over at Apple), which means that you can play these sound files in any music program and on any MP3 device. Amazon also notably makes the purchasing process easy for iPod users. Once you download a little installer, all purchases will be automatically uploaded to iTunes or Windows Media Player. This makes the buying experience pretty seamless and removes all barriers to enjoying Amazon's lower prices.