I am using the following:
Dell Axim x5
PPC 2002
PDAWin 5.5
Ultramote extender
Pronto edit

Works very well, lots of good CCF's on this site. Modify these using Pronto edit and the Axim is transformed to a fully featured Color remote.

You need the extender to incease the range past 4 feet.

This Axim/PDAWin/ultramote combination works with the Axim X5 but will not on my Loox or Hp PDA's.

PS- Don't buy the Ultramote software - it is next to useless, buy the extender only.