Be sure to check out Last Kiss! which in addition to being a pretty funny webcomic is also an inventive reuse of copyrighted material in a completely legal manner. It’s legal because the creator John Lustig bought the copyright to these Charlton comic books at auction.
There’s more at his site about the origins of the online webcomic version of Last Kiss:
In late 1987, Charlton Comics was selling off the rights to all its comic books. By then, most of the “good stuff” had already been sold. What was left were series and genres (war, romance, western and horror) that had little appeal to modern American comic book fans, most of whom were only interested in superhero comics. Despite that, I had a vague idea that it might be possible to do something with the Charlton material.
For $400 I bought all rights to First Kiss – a 40-issue romance series published from 1957 to 1965. I took a gamble and bought the series sight unseen. It was the series with the most issues for the least amount of money. And I pretty much got what I paid for – schlock!