I find it particularly awesome that the original is free-of-charge and the knock-off is not. I'd totally help you tell everyone that that site is lame for charging for a knock-off of your free font, and it would probably make yours more popular. Twitter may work.

That said, I think theirs has many differences from yours. While most of these seem like horrible butchering in order to claim it's different, I'd want more proof that it's indeed a rip-off before spreading the information and in order to convince others.

In terms of more proof -- Can't give you anything concrete, since the website owners are trying to deny that it's a knock-off. But, here's what they say about getting the font to work correctly:

"To get just the right effect with this font, start each word with a capital letter (it will be a lowercase letter with the left side of the outline capped off) and end each word with the right bracket, ]. Try it! It's an Awesome] Font]!"

...Pretty sure I invented that, except mine uses the ^ symbol instead of a bracket.

I remember that crap'n'fonts site. They also used a free weight of Museo as a base for font that they put up for sale there.

The scrapnfont link you provided doesn't show anything anymore. I hope that means they took it down.
Can't wait to see your two new fonts finished!

Just to follow up -- I kept asking the people in charge of the site until they finally agreed to take it down.