Wow, you are all wrong.
Thin CRT is out. Samsung and LG have been selling 30" models for some time now. They are thinner than normal CRTs however they weigh the same and they are not LCD/PDP thin. Remains to be seen if they will ever really make it. Good concpet as CRT quality is still tops - until SED hits the market.
SED is the logical replacement for CRT. Technically it is much different, yet it still works in a similar way. Each pixel basically acts as its own little CRT (bad way of explaining it). They finally offer an LCD thin (or thinner) package with better than CRT quality. They are also easy to make and fairly cheap. Toshiba should have 60" models out by the end of the year. Why are 60" models important - because unlike LCD and OLED, they have perfected the technology, adapting it to smaller sets will be easy as opposed to working your way up.
OLED is the next logical step, but still has a long way to go. OLEDs can be paper thing, folded, rolled, etc... and use almost no electricity. If OLED can ever make it to market, the fight will clearly be between OLED and SED, LCD and PDP are for all intents and purposes dead.
CNT is in the starting stages. Carbon Nano Tubes offer some cost advantages over other types of sets, but I really see these as SED II, not really something new. They will probably begin to integrate the tubes into a lot of devices and most next gen sets will benefit from them.