Server Side jQuery

OK, I know about Jaxer & the env.js stunt to fake a DOM for JS outside of the browser.

But the question I have is: can I use jQuery on the Server without the above?

I don't particularly want to use Jaxer (I don't think it runs on Google App Engine, and other environments I plan to use), and env.js seems to be a bit of a hack and doesn't always work for me, at least on my desktop running Rhino and spidermonkey.

Is there a plan for factoring jQuery into two parts, one a core that runs everywhere, and a second, browser environment jQuery?

Hope this is not too noob!
-- Owen