Informationweek tested openSUSE, Ubuntu 8.4, PCLinuxOS, Mandriva Linux One, Fedora, SimplyMEPIS, and CentOS 5.1. All performed well, and each had at least one truly outstanding feature. From the article:

In the last couple of years, desktop-friendly Linux distributions have taken enormous leaps — they’re easier to install, better maintained, and more powerful than ever before. There’s also that many more of them — which means that many more possibilities to sift through.

In this roundup I’ve looked at seven Linux distributions, all mainly aimed at desktop users. Some ought to be household names; some are less widely sung but still worth looking at. All are meant to be top-of-the-line, “throw-and-go” distros for general use, so I paid careful attention to how they behaved on a fairly broad range of hardware — how display, networking, or other default configurations were set to behave both out of the box and after an update (if one was available).

Related: Which Linux Desktop Distribution is the best for me?