IT Reviews has given Ubuntu 6.06 LTS their “Recommended” award. From the review:
Ubuntu 6.06 LTS is a very complete and usable Linux distribution and one that's remarkably easy to get to grips with compared to some others. All of which makes it a good starting point for newcomers, but don't be fooled into thinking it's cut-down in any way. As well as appealing to the hobbyist, Ubuntu is a full Linux implementation with everything needed for business use, including automatic updates and commercial support should you need it.