GUI apps in javascript without a browser?

JsLibs

Today I came across this: http://code.google.com/p/jslibs/
(from DZone) JS Libs seems to meet my requirement. I'll have a look, and if I find that it's interesting, I'll post back here.

Check out Adobe AIR.

From Wikipedia:

Adobe AIR is a cross-platform runtime environment for building rich Internet applications using Adobe Flash, Adobe Flex, HTML, or Ajax, that can be deployed as a desktop application.

Also check out Mozilla Prism (in beta).