Informit.com has made an article about trying Linux without all the commitments of an install – Knoppix, MEPIS, Ubuntu and DSL are mentioned.
The two-page article starts here.
Nervous about installing Linux on your machine? Fear no more, because Live CD enables you to run the operating system without installing it. Bryan Hoff tells you what cool things you can do with Linux Live CD, and evaluates some great distributions such as SimplyMEPIS, SLAX, and Knoppix.
It was spotted on Distrowatch weekly news where they also mention Ubuntu and Drag's guide to Debian variations.