boct1584: Just a random thought. The only Linux distro I've ever used is Slax, for hacking In The Groove 2 arcade cabinets, so I don't really know anything about what the Linux distros that'll be included can and can't do.
Running an older version of Windows might work for Windows GOGs.
Oh holy crap sir/ma'am, have I got some wonderful news for you!
http://distrowatch.com/
There's stuff intended for wall wart comps and stuff intended for high end development workstations. Linux Mint 12 is probably the easiest way to get started on a desktop (without even installing anything) but take a gander at Damn Small Linux (DSL) and then go look at insane fucking hackers like these guys are doing for seriously custom installs:
http://wiki.daviddarts.com/PirateBox (if anyone thinks that link is not kosher I'll remove it, or won't be offended if a mod does, I just think the tech is fucking awesome). That's just a small team, how about a custom DVR (aka Tivo):
http://www.mythtv.org/ or the guys that that mythtv was "too hard":
http://mysettopbox.tv/knoppmyth.html or the guys that wanted Myth on top of Ubuntu:
http://www.mythbuntu.org/.
This isn't vanilla ice cream, this is 1001 flavors! The dark side may have cookies, we have everything (including cookies)!