Just found this really good site about interlacing, de-interlacing, methods and descriptions about just about everthing you want to know about interlaced and progressive....
also, this same guy has a free calculator re: fixed ratios and changing sizes, includes 4:3, 6:9 etc.
Yes, the 100fps has been around for quite a while and provides good information.
ya, my head is swimming...so much info...I guess for me everything but the
divX codec (can use another now and not have same probs he talks about ) is
great to keep handy for future reference...