Here are the full specs for both the Nokia N900 vs Nexus One

Here are the basic highlights

Where the Nokia N900 Really Shines ~

*~The Speed of the Nokia N900 is faster for the 3G Data Connections . . . 7 Mbps on the Nexus vs 10 Mbps on the Nokia

*~Built in Stereo Speakers on the Nokia vs a single speaker phone on the Nexus One

*~32GB Hard Drive Built-In on the Nokia N900 vs no hard drive on the nexus both have Micro SD slots for optional upgrades

*~Better Quality Camera and a Secondary front facing camera for
video chatting on the N900

*~FM Radio and Transmitter for easy wireless car integration

*~Adobe Flash 9

*~Built in Skype integration

*~TV-OUT Watch DVD QUALITY Movies and Flash Videos on any Television!

*~ Full Keyboard

*~ Better for Multitasking

Where the Nokia N900 Really Shines ~

*~ Faster Processor

*~Slightly larger screen 3.7 on the Nexus vs 3.5 on the N900

*~More Sensitive Touch Screen


*~ Better Maps App

Hope this Helps