I don't think the N900 is too thick, although thinner would be desirable. My current phone is 23mm thick, and my pockets are ready to burst when I'm carrying both my phone, N800, and occasionly a camera. The N900 will free up a lot of space, while providing more convience then I get from carring three seperate devices.

As for women wanting the N900. My wife carries the N95 and cannot wait to upgrade to the thinner N900. She wants her some Maemo.