Here's a link to a .pdf file that may interest some of you. The book (19 pages) was originally published by the BBC in 1999. Yes, that is ancient history in today's terms as it applies to "technology," but it has some information that is still pertinent today.
Boy, letterbox PAL still has 432 lines of resolution. That's way better than the 360 we have in NTSC land isn't it! Almost as good as anamorphic NTSC video. Yeah, it's still good info.