Model is KDF-E50A10. Looking at Sony's website it's difficult to tell if they make a similar model anymore (they seem to only sell LCD screens now?) but similar models from other manufacturers retail for around $1600 on Best Buy's web site.
I bought this in late 2005 for ~$2000 and purchased a five-year warranty with it for ~$400, which is good until late 2010. This warranty provides the first bulb replacement free (which otherwise costs ~$200?) and I haven't had to replace the bulb yet.
I live near Palo Alto; I don't own a truck or anything, so if you buy this you need to have or arrange transportation yourself. I accept payment on Stars, FTP, or with cash.
I'm selling it because I recently replaced it with a 58" plasma. Here's a picture:
CNet review which should answer most questions.
These are going for a bit more ($200) on Craigslist than I'm charging but I'm happy to help out a 2+2er.