A week few weeks ago, I was bored when I got in from work, so I grabbed my notebook and booted into Ubuntu Linux (version 7.10). I wandered over to Second Life and downloaded the Linux client, unpacked it and tried to run it.
It immediately told me that my video card’s not supported (Wonderful ATi integrated video card, etc), but allowed me to continue on my way to try to log in.
The text was jittery and bugged out as all hell in spots, blinking off and on like a webpage circa 1997 in Netscape 4.x, and a bit hard to read, but I entered my login information, pressed the button, and actually ended up in-world in Second Life. It actually loaded and rendered fairly well, kind of like what an old desktop would have done, but I could interact with the world and walk around.
The fun part is that on the exact same hardware, I cannot run Second Life within Windows, because it would hang after 20 seconds, every single time, and has done so over the past year.
It’s pretty fun when it comes down to it all: I have to actually switch operating systems on this particular hardware set to even play a game like Second Life. 
Open Source proponents might actually declare this a minor victory. 
