just curious because I'm pimpin' osx on my macbook until I can either get another windows license or find a windows xp home sp1 disc to use my key with, if anyone knows of any totally rad games for Mac.
googling mac games is just about as bad as googling ps3 games
everyone knows PS3 has no games.

Diablo II :)

Ambrosia Software has a number of fun games, I'd recommend EV Nova.
Also all of Blizzard's games since Starcraft/Diablo II (whichever was first) runs on Mac OS X.
+ DOS games (use [url=http://winebottler.kronenberg.org/]Wine to unpack the GOG installers).
ScummVM + any games it runs (Wine again for GOG installers).
...this should last you a little while.

Fable
BioShock 2
The Path
Sims 3
Dragon Age
Age of Empires 3
Max Payne
These companies do good work:
http://www.feralinteractive.com/
http://www.transgaming.com/

The PS3 does so have games! Its got Heavy Rain, InFamous... Heavy Rain...

Frenzic is my favourite. http://frenzic.com/

Bioshock
The Force Unleashed
World of Goo
Braid
GLTron (one of my long-time fav)

There's a modern remake of one of the ancient mac games Stunt Copter. Now that I think of it, I have a feeling that might be the only game I've ever played on a mac (other than the classic "why won't this piece of shit 802.11 adapter stay connected?!?!?!?!")

I prefer the sequel, "why won't my bluetooth discover windows laptops?"

Blizzard games in general work on Mac too, IIRC

Eschalon Book 1 is for Mac.
Spiderweb Software develops ALL of their games for the Mac first PC second..

PS3 Titles:
Just this last few weeks you can put them on the list of all the normal multiplatform games (such as Bioshock 2, Final Fantasy XIII), but you also have:
Little Big Planet
Heavy Rain
Uncharted 2
MLB 2010 The Show (the best MLB sim ever made)
God of War 3 on the way this month
Valkyria Chronicles
The amazing Q-Games PixelJunk series (Monsters, Racers, Eden and Shooter)
Echochrome and Echoshift
The Ratchet and Clank games
Killzone 2
Fat Princess
Demon's Souls (for the hard core masochistic gamer)
Disgaea 3
Flower
Infamous
Metal Gear Solid 4
The Resistance Series
Warhawk
What you do lose with the PS3 is a nice sense of community, but outside of Mass Effect 2, I've rarely found a SINGLE player experience on the 360 to be as satisfying.
However, give me a hybrid such as Borderlands and I'll choose the 360 version every time because it's easier to chat, etc.
On another note--as a Mac user I'd given up on gaming for the most part--but this new Telltale Games announcement helped. Now that Steam is being ported to the Mac life is looking even better.

Gamersgate has quite few Mac games for sale including most Paradox's own games. Most of them cost more than the PC version however.

That's the worst part about Mac gaming. Because they're such a limited commodity, people love to overcharge for porting old titles. Aspyr is notorious for it. Civ III is still 40 bucks for Mac (but only 5 bucks for PC via Steam). Likewise, the original Call of Duty is 30 bucks for Mac, but you can get CoD I and II for the same price for PC.
I'm really hoping that this mess is about to change as bigger names put their weight behind the platform.

Telltale store has Mac version of Tales of Monkey Island and Sam & Max; They're free if you already bought the PC version of both series.