http://www.bogost.com/games/a_television_simulator.shtml
Nicely timed, we're discussing exactly this issue on my other forum (http://nfgworld.com/mb/thread/661).
I use a pretty modern crt, and even via rf my atari etc have very flat colours and little of the blending effect.. is my tv TOO good?
Í have a SONY CRT flat trinitron. It has an option for change image definition, I put it low at 8bit stuff and in the middle for Megadrive.