For those of you who love Mario Forever series, there's finally a complete and decent serie of TASes of World 1 to World 8. I use Mario Forever Advance Edition (the official "hard mode" of Mario Forever 4.4).
It hasn't been easy, for Hourglass causes crashes a lot, and it's very hard to do precise jumps and manipulate luck in Mario Forever.
I would say, things got increasingly hard since World 5, and World 8 is extremely hard. So, enjoy.