I know I'm opening up an old thread but I've done a lot of work on smnet (spidermonkey-dotnet). In the recent years. It's main development focus has been seamless embedding of .net objects into the spidermonkey engine. It supports a wide variety of conversions from js values to .net objects. Some of those including delegates and events.
Just saying it might be worth checking into now that there's some steady development on it :).
I do keep the SVN repo up to date with bug fixes and new features. The source and project solution files are configured to successfully build on download. If there are any problems using it, feel free to open a discussion.
I do understand the desire to have a managed javascript solution, but of all the managed javascript's I've used they're all very lacking in some key features that help make them both robust and easy to work with. I myself am waiting on IronJS to mature a little. While I wait, I have fun playing with spidermonkey-dotnet =)
spidermonkey-dotnet project and download page
Edit: created documentation wiki page this afternoon.
