You know the drill by now. So, click and enjoy!
http://www.openoffice.org/ I love this program. While it is nowhere as pretty as anything that Microsoft makes, its just as functional and can read and transcode everything.
http://www.ubuntu.com/ Microsoft are Morons... and that's coming from a current Microsoft user. Don't get me wrong, I like Vista, in fact, way more than XP. But still, there is a ton of potential in this turkey that wasn't noticed by developers. So then, why do I stick to Vista? Simple, game developers never looked much into Linux. If you aren't a gamer and don't need to use any special software like MatLab, take a look at this.
http://www.python.org/ C++ is scary. With so many lines, it intimidates pretty much anyone. Python is easy to read and nowhere as intimidating as other programs. In fact, you can make a "Hello World" program in five seconds.
http://www.ccleaner.com/ Ccleaner means Crap Cleaner, and it more than lives up to its name
http://www.wisecleaner.com/ A registry cleaner, enough said.
http://combatarms.nexon.net/default.aspx A free online-shooter from Nexon. The action is fast, almost spastic. The only bad thing is the "system" that was set up for acquiring equipment, which demands that you play a lot.
http://www.warsow.net/?page=home It's Quake that anyone can edit, modify and redistribute. And it's cel-shaded.
http://www.hardocp.com/article.html?art=MTI5OCwxMSwsaGNvbnN1bWVy Thirty Days with Linux. Consider this if you want to convert.