I heard somewhere that it is possible to hook up a PS3 wirelessly to the new Sony LCD TVs. is this possible?
I was pricing some of them and the KDL-40V4100 stated DMEX compatability and DMEX connection. Anyone know what this means?

Have you tried Google? http://www.dmexgateway.com/

yes. and that link is pretty unclear and doesnt really answer my first question

I'm pretty sure there's no way to hook up a PS3 to any display device wirelessly... at least not without significant loss in video quality and probably some added lag.

1080p sources routinely hit 20+ mbps which is 2.5 Megabytes/sec. Add in the fact that that is compressed data, and not raw pixel data and you begin to see the impossibility of it all.

This is for streaming media to a TV, not actually connecting the video from the console wirelessly.