I whipped up a quick PHP script that allows anyone (even PC users like myself) to search the iTunes Music Store. Sound clips are in Apple’s proprietary M4P format, so don’t expect to be able to listen to them unless you have iTunes installed.
You can try out the search for a limited time here (until it gets too popular), or download the script for your own site. Feel free to modify it however you like.
Update: Apple seems to be encrypting (or compressing?) their XML now, which breaks the script entirely. It doesn’t seem to be gzip-encoding, either. Any guesses on what they’re up to?
February 10, 2004: Someone sent me the e-mail below, discussing how they figured out the encryption. This is a bit above my head, but other people may find it useful.
April 17, 2004: Someone finally wrote a script to work around iTunes encryption. Go play with iTMS-4-All.