The post appearing today on Google's Chromium blog talks about how the SPDY protocol has been adopted by Chrome, Opera, Firefox, and even Internet Explorer. There's also sever and middleware vendors supporting the protocol but perhaps most importantly that SPDY is being used as the basis for the HTTP 2.0 protocol.
The blog post today also shared new performance numbers for SPDY compared to conventional HTTPS traffic. The performance was measured in terms of latency for loading Google News, Google Sites, Google Drive, and Google Maps. There's double-digit reductions in latency across the board thanks to SPDY. "SPDY delivers significant latency savings for users with fast connections, at the median, and for the long tail users with high round-trip times. In parallel with our contributions to the HTTP/2 standard, we continue to prototype further SPDY performance improvements through smarter compression, flow control, and prioritization. Our hope is that each of these will deliver better and faster SPDY and HTTP/2 protocols."
More details can be found via the Chromium.org blog.