Lately I've been messing around with some cross-domain Ajax stuff and came across this cool Dynodes technique by Kent Brewster. In the comments, I noticed that someone was looking for an article about "two-way communication in the script tag", and I realized that that was what I had been doing...so I sort of wrote one.
Has it been done before? Sure -- in his own SpiffY!Search, for one -- but it's a big leap from Dynodes to SpiffY!, and Jeff's comment made me realize the need for an intermediate article. Hence, bidynodes!