hpwoptimizationperformancemhtmliecsswebHigh Performance Web Sites :: Aptimize: realtime spriting and more
High Performance Web Sites :: Aptimize: realtime spriting and more stevesouders.com
As well as realtime spriting, Aptimize are using data: URIs in their Website Accelerator tool and doing so for >IE7 using an MHTML workaround. Clever.