For example, my current favorite Half-Life: I was wondering how you would translate the relative toughness and firepower of the characters into NPC stats? I know that scientists are very easy to kill, Barney the security guard is a little tougher (that vest and helmet presumably), the soldiers tougher still, the black-ops agents about as tough but a lot faster, etc.
Has anyone done anything like this? Or do copywrite issues get in the way?
I dunno about Half-Life, but Myth by Bungie has been converted to a GURPS environment. I guess it depends on how badly people want to play a GURPS game based on that videogame.
I’m sure that someone has read the stats from the files and posted them somewhere on the web. Check out some Half-Life fansites.
For instance, here is a table with weapon dmg stats (page down):
People who make mods have to dump all this stuff. Go to a HL fan forum and ask for a link to such tables.
A semi-hijack but the game Fallout was originally designed to use the GURPS system. Somewhere along the line Black Isle and SJG came to a disagreement and the GURPS system was dropped in favor of one they developed themselves. I’ll see if I can dig up a cite somewhere.
Damn hamsters ate my frigging post.
Anyway, most of the stats for half-life equipment are probably available in a GURPS book somewhere (I mean, geez, there’s millions of the darn things…and they’re mostly all really good, too). The rest would be pretty easy. You’d probably have to adopt some of the cinematic rules sets to make the characters more durable. Say, require everyone that should be durable to take a few levels of Hard to Kill. You’d also have to ignore encumbrance to get that special “everything but the kitchen sink” feel that video games have. 
I’d really like to see a GURPS Fallout…too bad they did have that falling out. Thief or System Shock would be great, too, come to think of it.
OK, here’s the cite. (Check the sidebar on the right.)
Relevent point…
To which, my only comment is… 
Yeah, I knew about the Fallout / SJG issue. I was really looking forward to a GURPS based videogame!
I have plenty of GURPS books and there is nothing that prevents someone (with enough time) to convert values over.
I’m not a big fan of AD&D based games. I wouldn’t mind seeing all those AD&D games being transfered into GURPS (I consider GURPS to be more realistic than the AD&D system).