Here's a iTunes promotion I just found. I saw this deal today when I was at to get a quote on a car rental for around the holidays.

If you register your Avis wizard number (your ID number) with their iTunes promotion, you'll get a code for 5 downloads for every rental of 1 to 4 days and 10 downloads for every rental of 5 days or more.

So, if you travel a lot on business or whatever, and need a car rental anyway, you can get some free iTunes. Here's a link:

Apparently, they've been offering the promotion for awhile, but this was the first I've heard of it (I don't rent a car everyday...LOL).