The research that Dave West and I did on the state of Agile adoption is now published. Here's a link to the actual document, and here's a quick snippet about it from InfoWorld. The short version: If the odds that you'll wind up on an Agile team in your next job is at least one in three, Agile has certainly gone mainstream.
I'm writing a separate piece on the implications for technology companies separately. Meanwhile, the research on requirements in the tech industry is in the final editing queue.
[Cross-posted at The Heretech.]