You might want to check out this site becasue you can download their contract and review the terms.

As for actual compensation, there would be a number of factors:
-What percent of the content on their site is yours?
-What kind of traffic is the site getting?
-What percent of his site revenue is based on the ads?
-What is the value that your content adds?
-Will your content increase their traffic?
-What effort are they bringing to the table, are they just setting up and RSS feed and adding the Ad server code?
-Who will benefit more from the agreement? (i.e. are you gaining exposure or are they gaining your audience?)

Not sure about case studies, I’ll see if I can find any.

It would depend on your agreement with them that gave them permission to do the re-branding and to reproduce your content. It could even be nothing (let us hope you did not do that).

Zero – my content is always licensed under a Creative Commons-Attribution-Sharealike license (see Creative Commons). I consider it an honour for my content just to be spread around. (Heck, my latest blog article was translated in another language – that is very satisfying :).

Sharing ftw :)