We've decided to update XKit. It's harder than it looks. We're not in contact with the original XKit Guy, nor do we have access to xkit.info. We currently operate at this blog and on GitHub.
Er, could you upload the chrome crx as a standalone somewhere for us Opera users? I can't find it and google won't let me grab it. It might be worth putting it on the Opera store, I don't know!
You can grab it here under v0.1.0 (second from top).