Posting here just in case anyone else is interested...
I've started a project to add a V8 API to JavaScriptCore. (Currently 3.14, the version used by node.js 0.10)
I've also created a fork of the node.js project with patches applied for building for iOS and OS X using both the V8 simulator and v8like. (Currently 0.10.36, the latest stable version of node.js)
There is also an Android/iOS project that uses Cordova to interface with these projects using the Ace editor as a GUI.
There is a hack for accessing typed arrays by wrapping node's Buffer class in a native object. This could, most likely, be removed if a typed array API is ever added to JavaScriptCore.
I've been bugging the WebKit team for this.
There's also still a bug where node Buffer's are not being garbage collected. This could either be something to do with the native object hack, something with the v8::Persistent implementation, or something completely different.
I appreciate any feedback on the projects.