LCDs are very easy on your eyes because they don't have the same concept of refresh rate that CRTs have, but if you run your CRT at a decent refresh rate this isn't an issue.
LCDs
are easy on your eyes, but they are
ugly!. If you run them at the resolution they are made for and make sure to look at them at the proper angle they are ok..but use a different res and they are hideous, a poor angle and you can't see them. I don't think the colour definition is as nice, and they are a little blurry for games. (Like motion blur from 3dfx only it doesn't need to be programmed for

)
LCDs are nice because they are flat...but all in all, there's no way I'd take an LCD over a nice Sony CRT.