This is what I wrote in the other thread like this that you started.
Originally posted by DigiMark007
There isn't one set site that has every comic, but it's occasionally possible to find downloads of various comic runs and individual comics. Long Pig for example, found a few hundred issues of Thor...that's the only one I know of though. They're pretty rare...and also illegal....and thus hard to come by.
Random google searches will turn up a decent number of things.
...but since this technically a less-than-desirable endeavor for the comic industry (to put it mildly), I'll be closing this. Good luck and all with you search, but remember that you should purchase the comics that you truly enjoy, both to support a flagging industry and for your own satisfaction.