Be sure to check out the guides
http://www.animemusicvideos.org/guides/
If you are gonna be using a downloaded source, make sure you convert them to huffy, lagarith or another lossless compression.
If you edit with clips encoded with divx, xvid or other lossy codecs, you will run into some problems.
For cropping and stuff you will need virtualdub/mod
btw thats a wordfilter the site has
Thats why you cannot type you tube without it changing into boochsack^_^