I've been an iPhone user for about 2 years now, but I ordered a Nexus One the same day they became availible in Canada.
Here are my first impressions.
- The packaging is as slick as an iPhone.
- The phone is a millimetere or two thinner than the iPhone, but overall its almost exactly the same size and it is going to fix in most of my iPhone holsters etc.
- It comes with a 4 gig microSD card already in the phone.
- Starts up with an animation as an indicator.
- The screen is much brighter than my iPhone. and faster.
- The onscreen keyboard is very similar to the iPhone, so I'm not having much trouble with it. It doesn't come withteh keyboardsound feedback enabled however which I'm missing right away. I may be able to turn it on once i get things going. (update: indeed you can turn on the click sounds).
- Battery status shows you what applications/features are taking up the most battery power... very handy.
I'll have to explore more, but I'll post anything else I find that is particularly cool or different.