I love the results, the slashtags, and the awesome metadata, but I hate that the search box is relentlessly autofocused on result pages. This breaks keyboard scrolling and some other keyboard interactions, like hitting backspace to navigate back to the previous page. Autofocus is fine on the front page of a search engine, but it gets in the way on result pages.
OT: Does it also bother you that Google's Instant has broken the back button on search pages? Back now transfers the cursor to the search box, which is a feature I find incredibly annoying.
Yes, I find this annoying as well.