I'm not much of a gamer anymore, hence my MB purchase, but I'd like to pick a cheap game up just for killing time.
Any suggestions? I know I could just pour over countless reviews, but I trust the opinions of people here, especially when it comes to what games will run best on my lackluster GMA video. I'd prefer something along the lines of an RTS, RPG, or something similar that won't really require an external mouse.
It can be for either OSX or WinXP.
Heroes of Might and Magic IV goes for $7 on Amazon right now. Easily the greatest strategy RPG ever created for PC/Mac, in my humble opinion. It also sounds like it's exactly what you're looking for.
MMORPG fan? World of Warcraft seems obvious, given it's $20 price tag (although monthly fees have to be taken into account). Otherwise, virtually any other Blizzard game is a good bet (most of them come in Battle Chest collections at about $20 now).
Unreal Tournament 2004 is available for $25 right now on Amazon - incredible game, easily one of the best multiplayer shooters of all time, if not THE best, although I know you're not especially interested in FPS's.
Age of Mythology is decently fun, available for $14 on Amazon.
Baldur's Gate 2 is also $14 on Amazon, and is arguably the greatest RPG of all time. Definitely look into this one.
Lord of the Rings: Return of the King is an entertaining RPG/beat-em-up going for the incredible price of
$3 on Amazon right now. I'd buy it if I didn't already have a copy that I got for $10 the other month (thinking I was getting an excellent deal).
Fallout, another one of the best RPGs of all time, is going for $12 on Amazon, and its even superior sequel, Fallout 2, is going for $15.
Alien vs. Predator 2 is going for about $7 on Amazon. Another FPS, but well worth looking into, as it's easily one of the greatest shooters I've ever experienced, both in singleplayer and multiplayer.
Stubbs the Zombie is $7 on Amazon, an excellent title but runs horribly on Intel Macs from what I've been told (I've only played it on Xbox).
Rune goes for $1.49 on Amazon. A first-person fantasy hack-and-slash/shooter, this classic title may be rather dated graphically but is still well worth playing today, if you ask me.
Especially at a price like this.
Hopefully that gives you enough options to look at. There are plenty of incredible budget titles available for Mac, if one bothers to search for just five minutes on Amazon alone.