Quite an old site that people are aware of already.
I'm not sure how amr decides its content, but there's oodles of known scans that they don't use.
Archive.org is a great site though. Its not just magazine scans, they also have isos of magazine cover discs, Fred fish collections, and other assorted PD isos, and, and, and......
Took me months to leech all the stuff I was interested in, and the content keeps growing.