I've noticed that Google appears to be showing loads of pages as not cached today, including some very high profile ones. Even the BBC and Amazon home pages appear not to be cached (see below, click to enlarge):
BBC homepage not cached
Amazon homepage not cached
The Facebook homepage appears to be OK however:
Facebook homepage cached
I don't know what's going on there but I bet a few SEO's have turned a bit white at some point today...
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