drivebuy

because only spdy has demonstrable value in production.

What demonstrable value? Google has never compared it to pipelining and when Microsoft did so they found it about the same and sometimes slower.

There is next to zero value in SPDY over pipelining across several connections. It's just complicated for no good reason.

With SPDY as implemented all requests for google analytics reuse the same TCP connection. This connection acts as an implicit tracking cookie uniquely identifying your browsing session.