Google spends a lot of time tweaking their front page when they really should be working on their results page, which has stayed the same for about a decade now

Google spends a lot of time tweaking their front page when they really should be working on their results page, which has stayed the same for about a decade now. Actually they spend a ton of time tweaking the results page, and there have been a lot of changes in the past decade. Most of them are fairly subtle: fonts, spacing, colors. Some of them are quite obvious: the Comment, Promote, and Remove links, for example. They've also integrated other forms of search into the results page (maps, shopping, twitter), and put a lot of work into optimizing the load time. There is at least one (fairly large) team working basically full-time on the results page. They do a lot of A/B testing; only design changes that "work" are released to everyone.