So David’s relicensing his blog content – good for him.  One thing struck me:

doesn’t allow any derivative works (I don’t really see the relevance of it in this context, but I’m happy to be persuaded).

In the context of Australian law, with our whole not having fair use like the US, what implications does this have for quoting from your blog?  What if I quote the whole entry and comment on each paragraph?  What if I have ads on my blog – does that make it commercial?  How is the average Joe supposed to work out all this?