The Xoom runs Android. It is fairly similar to the ipad in terms of its ports etc. It does have a slot for a micro SD card though.
There is another tablet called the Asus Transformer that turns into a Netbook. It also runs Android but comes with an optional dock that has a second battery, keyboard, trackpad and usb ports.
See an ad for it here: http://www.youtube.com/watch?v=r5xW3NhdjqI
The quality of the materials is not as good as the Xoom / ipad but it is about 100yoyo cheaper.
JAMESCORK (10-06-11)
Agreed. Apple produce quality kit.