We're not entirely sure of the time line here, but it looks like Google has now rolled out the SPDY HTTP replacement to its full bevy of Web services, including Gmail, Docs, and YouTube. If you're currently using Google's Chrome browser you're probably already using SPDY.
We originally reported on SPDY way back in November 2009, when Google introduced it as yet another experiment in making the Web faster, like Go, Native Client and speculative pre-connections. Over the last 18 months, though, SPDY support has found its way into the stable build of Chrome.
SPDY is basically a streamlined and more efficient version of HTTP. At its most basic, SPDY introduces parallel, multiplexed streams over a single TCP connection -- but at the same time, SPDY allows for prioritization, so that vital content (HTML) can be sent before periphery content (JavaScript, video). All in all, the SPDY protocol can halve page load times, which is obviously rather significant.
