Thanks for the heads up on Good old Games.
I haven't put too much time into Splinter Cell (waiting for that gamepad to arrive), but I'm liking it so far. It seems a bit more linear than the MGS titles that I've played lately, but I like how the lighting effects are used to cover you up.
I picked up Civilization IV for 5 bucks off of steam, so I'll check that out at some point too. Again, never played one of these games either.