A TV does affect soundstaging dramatically due to acoustic reflections from the screen. But everyone seems to agree problems can be made less noticable by moving TV forward/backward in relation to speakers.
Room Acoustics
I pushed my 34" widescreen TV back more towards the front wall yesterday, getting it out of the way of the 2 speakers thinking of improving the sound. The soundstage did expand, but the imaging was less defined. Does putting a television between a pair of speakers actually improve their imaging? Are their any advantages as to put a big object between the 2 speakers?