After three decades of programming from a chair, I switched to a stand-up desk this year. It is better for health, posture, and programming focus. It takes discipline but there is a payoff, especially for us older coders. I still do laptop coding around my family from comfy chairs, but I'm now upright for the hard-core office work.
I installed mod-pagespeed recently on a server, and it had some unintended results to put it mildly.
Needless to say, mod-pagespeed was immediately removed from our server. I expect that the Cotendo CDN will also have these sorts of issues, which will drive website owners and developers crazy. It will be interesting to see how major content providers react when their content breaks because of the CDN.
The Ajax-based library is open source, and easier and cheaper than Flash development. Since you don't need Flash, it also works on iPhones/iPodTouch and is not thwarted by Flash-blockers.
Disclaimer: I wrote it and put this library in the public domain.