Ok, sure, I know there are some people who require the much better resolution for work (graphical design, programming...), and for workplaces you can probably fill an office 17" monitors for a song, but for most [home] users, a dedicated computer monitor is a pretty dumb purchase. For generally less money you can get a television, that can do the same things as a monitor, but also has built in speakers and doesn't require any extra hardware to play television/cable. Since most computers/laptops now days have HDMI output, it's even a better proposition.
TV plus computer is a much better entertainment option than TV in one place, computer and monitor and speakers in another. It's also a much better web entertainment option than web-enabled TVs or even Xbox/PSx--apparently these are better, but I can put a keyboard in my lap and a mouse on the sofa and use a computer online much easier. My only real complaint is Netflix: on the computer is seems more laggy and lower res, on the PS3 the interface is shit.