If you work in SEO, you might not want to read this. Google announced on the 18th October that it would automatically enable encrypted browsing for searchers, but only for those that signed into their Google accounts. Protecting the privacy of users is Google's aim here. It means that Google isn't going to relay any search query data to Web sites.
This will no doubt see a serious drop in SEO analytics data, since Web sites will not be able to see the keywords that an encrypted search will yield a click-through for. There is an obvious compromise here between marketing and privacy. Most people reading this will probably come to the conclusion that most regular users of Google will not be signed with a Google account when searching. Google and all it's paying advertisers will be hoping it stays that way. Stats anyone?