That's my page, I had the Linux/ARM closed-source binary from citrix.com working on IT OS 2005 on a 770.

As I say there, no later version of the 770 or N800 will run the Citrix client. Until there's an open source version and/or Citrix release an armel (i.e. EABI) Linux/ARM version there's no chance.

If you downgrade to IT OS 2005, it's possible to get it working with some hackery, but you don't get any keyboard input.