online writing workshops?

I spent the morning kicking around the web through a variety of websites, google searches, JSTOR articles, compfaq and CompPile searches, etc. in search of some specifics on online/virtual/electronic peer review (or writing workshops). I spent about an hour and a half. It was an exhausting search and didn't yield the kind of results I was hoping for: suggestions for specific technology, logistics, results. From the tidbits I was able to find, I learned that research favors asynchronous over synchronous peer review. This is making me re-think my original idea, which was to use chatzy, in favor of using wikis. Still, I haven't quite figured out exactly how I am going to do this: have students post a page that is their essay, and then use the discussion section to answer workshop directing questions? Should students be able (in true wiki) fashion to intervene in the original text? My impulse is to say yes, as the author can view the history of changes, but what are the drawbacks to this idea? I'd definitely like to do more reading about this. I've gone ahead and ordered myself the book Virtual Peer Review: Teaching and Learning about Writing in Online Environments, despite it being in hardcover and way to much money for me too be spending right now.

In my online travels I also came across some references to designing hybrid courses, so I'd like to look further into those as well.