[skrebbel]

I like this approach, and I think that we're not doing it enough.

Does anyone know an effective way to do this in the browser, with JavaScript?

[igouy]

See http://www.lively-kernel.org/

Incidentally Dan Ingalls was a member of the original Smalltalk project.

[wldlyinaccurate]

I do this a lot in the JavaScript console. If I need DOM interaction, I'll usually just mock-up some HTML and access it via the file:// protocol.