This site is targeted towards people looking for information on video compression, but their information on de-interlacing, how it works and the various challenges faced can give you a lot of information on what your TV or media player is doing when upconverting content. If you can't understand why some people get so up in arms over the 1080p-or-not debate, or why SD content can look so bad on your brand new HDTV, take a look and be educated. There are a lot of ways to get around resizing and upconverting content, and some are better than others (blending fields, adaptive, bob, bob and weave or progressive scan, motion compensation or motion adaptive just to name a few).

[Via DV Guru]