Professional Projector vs. Big Screen TV?

jarb asks: "I've been wondering if I could pick up a business video projector for use as a home theater display. We use them in the office all the time and the picture quality is incredible. I've also been told that big screen TV's have short lifespans. Has anybody thought about this and what are the pros/cons?" Now this is a cool idea and one that I haven't thought of before. Of course, this could be due to the fact that I usually like to keep stuff on my walls...and that doesn't make them very good surfaces for projecting images.