We also try to use PDA to control trains: http://www.gbbkolejka.pl/gbbmobile.htm
Roco MultiMAUS Pro - Wireless
Roco have announced a wireless MultiMAUS.
The advance information we have from Roco is in German so the details are a bit sketchy. It looks like a complete starter system comprising the base unit/amplifier, Rocomotion software & the first handset (which looks like the wired Multimaus, except that it's blue) has a RRP of 399.00 euro, with extra handsets for 199.00 euro.
It look very much like a radio system & not IR.
I'll post more details when I get the English version catalogue (probably in a few days).
UPDATE: Info and links to product, a couple of posts down.
