If any of you are wondering what a good Linux Distribution is, I have a good suggestion.
Linux Mint. (excellent article on LifeHacker)
I run Linux Mint on an old Dell with a Pentium 4 processor and use that box to test Word Press code as well as other projects where I need a good Guinea pig.
As with most Linux distributions, Linux Mint is free.
Linux also carries a similar file structure to that of Apple so you need not worry about viruses and spyware; at least, not for now.
Many folks out there who just want to test their themes or a plugin will find Linux Mint more than adequate enough. In addition, all of the appropriate files are included so you don’t need to go searching for MP3 codecs, video codecs, etc. Everything just works out of the box.