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This is pretty ambitious, but I like it.

Excellent idea which has been floating around for awhile; Google's probably the right corporation to implement it. It's not even "ambitious", since the traffic won't be very heavy -- they've set up the cache headers to instruct browsers to use the local copy for the next year... so even if you visit thousands of sites using X JS library, Y version, you should only actually hit Google for it once.

On the other hand, I may avoid the JS API they offer to add some features to loading (wildcard versions, on-load callbacks), because THAT script is not cached, so will be loaded on every page (from what I can tell from the HTTP headers)... and I dread the google-analytics effect where your page load is stopped while a separate URL is resolved, connected, and returned... the size is tiny, but latency still gets ugly sometimes.

Fortunately, it's super easy to simply link the google-hosted JS lib directly.

No Mochikit makes me sad.