I don't have the device yet but from what I have read so far the device has a steep learning curve at first, and NOKIA is not making it easier for the users. It's up to the community to provide that I guess but it will be a while as the documentation catches up.

Other than that, I hope that the email and the maps application is working seamlessly. For me N900's selling point is the browser, and the unhindered linux behind. However, from such an expensive device I expect things like maps and email to be working seamlessly if not perfectly. I don't mnd the learning curve, or some of the shortcomings because of the device's internet tablet background those are a given tbh (and the shortcomings usually come with positive points as well)