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Tux Machines (TM)-specific
When last we looked at Linux Mint we gave it high marks on the user-friendly scale for administration and productivity applications. The latest release takes the distro to new heights of the same with a few new added touches to boot. Linux Mint 8 (Helena) is based on Ubuntu 9.10 and delivers all the basic capabilities you would expect in an Ubuntu distribution.
Downloading the Main Edition actually gets you 2.5 GB of data but comes in a 705 MB ISO file. Two additional download options include the Universal Edition which is free of proprietary software, patented technologies and support for restricted formats and the x64 Edition. There is a note on the Mint download page that the 32-bit Main Edition is usually more stable and also works on 64-bit processors.
For older PCs you might want to give the Fluxbox Community Edition a try. As of this writing it's still listed as a release candidate, so you'll have to check back later for the final version. This version is targeted at older PCs with minimal CPU, graphics and memory--definitely worth a look if you have an old PC lying around. If you want to give Mint a whirl as a program from Windows, there's mint4win, although there does seem to be some chatter in the Mint forums about compatibility issues with the current release and Wubi due to the use of Grub2.