Paul Banks at LinuxWorld Magazine have tried Ubuntu and is now a very happy man.
Read the review here
Overall, I was very pleased with Ubuntu. For a beginning Linux distro, it has everything you need to get started. Setup is quick and virtually painless (only the Wireless LAN Setup was somewhat unorthodox). For intermediate users, though, Ubuntu might seem a bit boring. Thankfully, Ubuntu is easy to customize and change to your liking.