I think I've answered my own question but thought I'd verify:
I'd like to use my HDTV speakers as front center speaker for surround sound. I was thinking I could connect my receiver's speaker output for the center front speaker to the audio input of the HDTV. Seems to me the HD Tv's audio input has a 1v peak to peak limitation and this would likely harm the input circuit of the HDTV or possibly blow the channel driver out of the receiver. That would be a bad idea, right?
I'd like so save the expense and space for a separate center front speaker. Any other ideas?