When they were first announced I didn't really pay too much attention to HDTVs. I knew that they will drop in price significantly just like any other tech so there was no rush to buy one.
But my decision to ''jump in'' was prompted initially by HD gaming, specifically Gears of War. Gears looks great in SD, too. But seeing it and playing in HD was a revelation. I seriously doubt I would have a HDTV if all the major consoles only supported 480p. Most hardcore gamers I know also say that the HD consoles got them buy an HDTV. And while I love HD video, I could have waited longer if consoles were out the HD equation especially due to the format war.
Currently, I have a Samsung 23'' Flat panel LCD. Not the best or the biggest but it suits my needs fine. I doubt I'll buy anything else in a while being the cheapskate that I am.
What pushed you into HD?