I have a couple HDTV calibration DVDs, and I actually used one once. Now that I've replaced the bulb on my Sony WEGA TV, I probably should do it again. But I just found out about an interesting location for a calibration tester in this NY Times article:
If you own any Sony Blu-ray discs then you have already have the calibration tests you need. Type in "7669" in your DVD remote control and press enter – the Sony Blu-ray will lead you through a series of tests and screens to get your monitor perfect.

