I wonder how hard it'd be to serve this data via DNS, like "dig -t TXT 0xdeadbeef.ocsp.apple.com". Then you get a nice, distributed architecture with lots of built-in cache handling, and since the data is currently served via HTTP, it wouldn't expose any more data to your ISP than already is today. It would also mean that if you have 100 people in the office and a local DNS cache, then each OCSP query would be made exactly once and then its answer shared among everyone else in the office.