Using your new T-mobile G1 "dream" phone to kill time in a verizon store.
Also, yay awesome phone! I wasn't convinced at first but having a web-enabled, geo-aware device with a qwerty keyboard, touch screen, and a good camera in my pocket all the time fundamentally changes the way I can iteract with the "real world". And the call quality is remarkable. Freaked out my step-dad at first, he said it "sounded like I was next door".
And the fact it's an open platform (I've already hooked it up to my computer and transferred files- something Verizon tries at all costs to keep you from doing) is awesome. I see app development in my future.