Me too, though a 2004 model, just a month before new ones came out (200 MHz faster, yeah). And they are tough little beasts, mine got water into the display (half a litre), thus making it Aqua^x. It survived that and several falls (slippery grounds). I even put it into an oven once.
And it ran the best OS Apple released, Mac OS X 10.4 Tiger. Weren't it for Spaces, I might have stayed with that OS.
The iPhone 3G I have, not because it's new but because the phone is 4 years old, purchased on launch date and I have never replaced anything on it. I have dropped it so many times, it's an engineering anomaly. It still holds a great charge as well. I plan to keep it until the iPhone 5 releases.
Probably my iPhone 4S. It made my life much more productive compared to the days of water-infused-iPhone 3G (i dropped it in water many times), which is unbearably slow + damaged internals made it insufferable overall. If Apple decides to overhaul their iPhone and MBP designs this year, I will be gutted - only if I actually like the new designs.
These 3 products were and are by far the most incredible devices Apple made IMO. The iMac G4 re-defined how you pictured a desktop computer, the TiBook was really the first modern looking laptop which can still be seen in laptops today including the current line of Apple notebooks. The Cube was simply an engineering accomplishment thats hard to ignore. A fully upgradable computer that used desktop components, no fan, and like the G4 ignored the paradigms of what a desktop computer looks like.