Got a XenApp server up and running now, with Office 2007, AutoCAD, Acrobat, and various other apps, and then enabled the site necessary for the iPad to work (as well as the iPhone and Android too).
Simply awesome. From an iPad 3G, I can access from ANYWHERE documents, and edit them in Office all from this tiny device.
Obviously Citrix is nothing new, but on the iPad it's so much more portable than a laptop is, while retaining all the documents on the network, safe and sound.
I'm really impressed with how well this works, in terms of functionality as well as speed.
Citrix on the iPad? Bad ass!