All: If you got here via a search, realize this is an old post (2008) and that Chrome now supports HTTP Pipelining and SPDY. Thanks, smp.
As a Web performance consultant, I view the release of Google Chrome with slightly different eyes than many. And one of the items that I look for is how the browser will affect performance, especially perceived performance on the end-user desktop.
HTTP Pipelining is the ability, defined in RFC 2616, to request multiple HTTP objects simultaneously across an open TCP connection, and then handle their downloads using the features built into the HTTP/1.1 specifications.
I had an Apple employee in a class I taught a few months back confirm that Safari (which is built on WebKit) cannot use HTTP Pipeling for reason that are known only to the OS and TCP stack developers at Apple.
Now, if the team at Google has found a way to circumvent this problem, I will be impressed.