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iMac G5, rev. A. Got my eye on a new iMac. Waiting for an update and for me to move.
 
Newest as in when it was made, or when you got it?

Newest as when it was made - Dual 1 GHz Quicksilver 2002 Powermac G4

Newest as when I got it - 400 MHz Sawtooth Powermac G4, upgraded to 1 GHz using a Sonnet G4 chip that had a transistor caught on fire in another mac, but very oddly still works.
 
Oddly enough, both categories are my main computers.

Newest (age): iBook G4 1.33 GHz 1GB RAM/Leopard. This was my first Mac actually, I got it when I switched back in July. Ah, How I remember how happy I was when I handed teh check over to the seller... *wipes eyes* Anyway, this computer I use at my Mom's house, where I'm lucky to get half an hour of time on the computer a day. It's mainly used for web browsing and iTunes.

Newest: (when I got it): 867MHz PowerBook G4. 768MB RAM, Tiger. I got it.. let's see.. five days ago. I use this computer as my main machine over at my Dad's house, where he is way more lenient, computer time-wise. it is used for messing around with Photoshop and Skitch, browsing the web, iTunes, email, and video editing my really crappy youtube videos.

</ramble>
 
Newest in age: SR Macbook Pro (specs below)
Newest in purchase: Bluetooth mighty mouse - my MBP's faithful companion :)
 
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