SPDY is a Google-developed technology designed to reduce web page load time. This is achieved by prioritizing and multiplexing the transfer of web page subresources so that only one connection per client is required. Moreover, servers may hint or even push content instead of awaiting individual requests for each resource of a web page.
Readers may have noticed for example that this website loads a lot faster on Chrome than IE10, due to our site implementing SDPY.
The good news is that Microsoft is doing everything it can to keep their speed crown, and from dissection of the leaked Windows Blue build it seems, with WebGL, Microsoft will also be implementing SPDY support.
With Windows 8 and Windows Phone using the same components it is highly likely the same support will also come to Windows Phone.
In other good news for IE, Google is forking webkit to create their own Blink rendering engine, putting an effective end to the argument that everyone should use Webkit.
In fact on the Chromium blog Google says:
… we believe that having multiple rendering engines—similar to having multiple browsers—will spur innovation and over time improve the health of the entire open web ecosystem.
Hopefully this means much less reliance of –webkit tags and more coding to standards by web developers.