It's portable, runs Linux, wifi enabled, streams internet music stations and can play videos and mp3s off a memory card. Best of all, you can surf the net using it's 800 x 400 pixel screen big enough to see most websites at their full width. I use this in places when a full laptop isn't needed.
This is a very solid tablet device and can connect through WiFi or the blutooth connection on your mobile phone. I use mine daily to check email, read RSS feeds and listen to streaming audio. If you add a portable bluetooth keyboard you've got a super small laptop replacement. You can do VOIP through Gizmo which works very well, but no bluetooth headset support unfortunately - at least not yet.