"Without a doubt the best phone I've ever used"5.0 starson by Ratnok
Pros: Live wallpapers, bright large screen, good camera with flash, SUPER FAST, plenty of memory for apps, feels good in the hand, free turn-by-turn navigation, 50,000 app strong Market.
Cons: A little glitchy at times, T-Mobile, no hardware keyboard. Poor screen viability outdoors.
Summary: I've used WinMo, the iPhone, Palm Pre,and Android (I've played with the Storm and Storm2 but hate SurePress and never bought it). This is hands down the greatest phone I've ever seen or used. The ability to customize the phone is unmatched. No phone is as personal and provides you with as many options as the Nexus One. Android 2.1 works amazingly well and is easy to use. Plus, when new OS updates come out, the Nexus will be first in line. ANDROID FRAGMENTATION ISSUE SOLVED!!! The camera is good and the flash is strong, but not too powerful to wash out photos. I could even download Swype and 2 other similar keyboards (SlideIT and that smoke any virtual keyboards for any phone. The Android Market is the 2nd largest available, and with 50,000 apps, that's more any anyone can possibly sort through and use. The News and Weather widget always keeps me up to date, and the notification system is unmatched. The multi-tasking is phenomenally smooth, and the battery life is twice as long as my old G1.
On the negative side, you can barely see the screen outdoors. That's the trade-off for having the most beautiful screen indoors. T-Mobile as a carrier sucks unless you live in a Major market network, but the rates are impossible to beat. Also the screen sometimes acts weird.
Bottom Line: If you want the best phone available and live in a large city. Nothing beats the Nexus One (well, at least until the EVO 4G).