Of course, this depends greatly on how you are using the device; if you have Bluetooth and wireless enabled, and if you have set the brightness at full power, then the battery will obviously get eaten up far more quickly.
For the most part, the Nexus One lasts about the same time as most Android phones, which isn't great as Google still needs to up its game in this department. Of course, the battery is removable so you could carry a spare or two and have the phone last for a few days time - but we doubt many people will ever manage to be THAT organised.
Being an Android phone, there are some great tie-ins to the cloud - for scheduling using Google Calendar (which is configured for you automatically when you enter your Gmail account), and for managing contacts that you import from Facebook or Google.
The Nexus One provides wireless and Bluetooth connection options, and they work the same as other Android handsets without any new features or radical departures. We had no trouble testing several Bluetooth headsets, or connecting to a variety of wireless routers and hotspots.