On Garrysmod.org While derping around I found someone had taken SWBF2 vehicles and adapted them to the game. I can't help but wonder, is this remotely legal? With Pandemic dead in the water and their properties floating around, is there anything wrong with using them?

Considering the incredible amount of stuff the GMod community has ported from other games, I'm going to say it's either legal or the individual game companies don't care when it comes to GMod.

(Oh, and troll faces unite. :3)

Of course it's illegal. IP and content doesn't become open-source when companies die, it's still owned by someone. In this case, it is irrelevant, since all the content was owned by Lucasarts (as publisher and the company paying for the content) anyway.