Now that info is trickling out, I can probably safely say that I got to use a Latitude XT about a month ago. My reaction is a definitive “meh.” I don’t regret my HP 2710p purchase at all. I certainly didn’t come away from the experience feeling that the XT is revolutionary.

For companies that use primarily Dell systems, such as where I work, this is going to be a nice system for those in need of a Tablet PC. With specs so similar to the HP, I think the dual pen/touch interface is going to be the big selling point of this tablet over the competition. For many users, being able to interact with a finger is just more intuitive than having to use a “special” pen.

You can buy felt nibs for some Wacom pens, which would probably work with any Tablet PC pen. I know the nibs for the HP 2710p fit and work fine in a four year old Fujitsu Tablet PC’s pen. I suspect the parts are fairly standard due to the specs of the Wacom active digitizers in many Tablet PCs.
http://direct.wacom.com/stores/5/Felt_nibs_5_pack__P1056C67.cfm