I've pushed forwards some more the concept already layed out by dojo and I'm at a stage where I'd like to get feedback from organizations and developers. I believe this type of standard would help foster more innovation and constructive competition among AJAX toolkits. In my opinion, too much effort is being spent trying to duplicate other toolkits features.
You can view the latest work here:
http://www.openmv.com/OpenAjax/tests/all-compressed.html
I've opened a proposal on OpenAjax:
http://www.openajax.org/member/wiki/Interoperability/RegisterResource
Some of you might be wondering, that's a lot of code! That trying to load all these frameworks probably sounds like a really bad idea. But with projects like a "javascript linker" that can remove used functions, there's a whole lot more trimming that can happen. The same is true for CSS.
There's still no CSS loading but don't worry, that's the next step.