I've been playing around with webpagetest.org for the last hour or two and the results are really quite good (in other words, there were a lot of optimizations that I overlooked).

For instance, here is HNs report: http://www.webpagetest.org/result/090808_21KF/1/performance_...

(not sure if that link works when published), it suggests that HNs .css files do not have their cache headers set properly.