LCD monitor-> TV

http://www2.dvigear.com/sico.html
If you have component video, this is cheaper:
http://dvigear.stores.yahoo.net/cohdtodvi.html

I use the "Video to DVI Converter/Scaler", and it works pretty good, though my monitor is a higher resolution than it supports for output, so I have to scale the signal twice, which reduces image quality some. Obviously, given the cost, this is more usefull for saving space (using the same display for console/DVR and PC), or if you have a really nice monitor, because you could buy a decent TV for less. Also, don't forget about audio. Most monitors don't have speakers, so you'll need to buy some, or alternately, you'll need to buy adapter cables to connect any existing monitor speakers to RCA audio.