Nokia N800 Internet tablet

Small and feature packed. It works with Googletalk out the box and also now supports Skype (with the latest software upgrade).

It has a virtual keyboard that works pretty well, and web browsing seems to support most sites.

There are apps that can be downloaded to make it pretty useful like an ssh client (and server), VNC client etc.

It's just small enough to carry around, but not as small as a mobile phone.

It also has sensible settings for Email (like supporting different smtp servers for different connection profiles.