The trouble is that it made the additional database ~120MB and the Zipped download 25MB. Not that that's much by today's standards, but it made uploading new releases a bit of a pain for me.
Note the lack of "http:" from the URL. This allows you to switch to and from using SSL without worrying about "mixed content".
You can read mode about the benefits of using a third-party CDN in this write-up.
While I have my reservations about doing it this way I just think it makes the most sense. It's just a shame there's no hosted version of Ext. Apparently there never will be as Google don't want to host anything with less than a completely open licence.
My "codestore time" for today has been spent moving to this new way of doing things, so you'll have to wait another day for the download. I still need to work out how to provide it without the 1,000s of demo documents currently in it but with enough to make the demos work.