With a lot of computers coming standard with DVD burners, and flash memory becoming cheaper by the week, CD-R's can be found at most stores for rock bottom prices in huge spindles. I picked up a 50-pack of these Philips CD-R's for a very good price at a local store. In reality, I do 99% of my backing up on other media now, like DVD-RW or my 8GB SD flash card, but sometimes I do want to make a music CD for the car or make an install disc for a program that doesn't require gigs, and these work well.
Thus far, I've had no bad burns with these CD's. Obviously, if you're burning something with a lot of small files, you shouldn't burn at a high speed. However, these will handle 52x like they say if you're burning huge files. You might pay a few dollars more for these, but they're worth it. There's an awful lot of cheap generic CD-R's out there, but what's the point of buying them if you'll throw out half of them on bad burns?