http://www.idealworld.tv/csp/isd/ide...yword=wireless
Only a 4 speaker set though, and a hell of a price!
Another option may be "virtual surround", my friend's Altec lansing 880 set has this, where the "rear" speakers are actually set at the front, and angled out to bounce back from the sides
http://www.hardwarecentral.com/hardw...eviews/1210/1/
http://www.hardwarecentral.com/hardw...eviews/1210/3/ - the two modes described.
The 880 is also a 4.1 setup, with the control system allowing adjustment of the virtual centre, and unlike more recent 5.1 systems driven from 3 soundcard outputs, the 880 is dependent on Pro-logic(analog) or digital modes.