It seems like every blog and his dog has taken to using Snap Preview on their links. This pops up the most hideous and enormous tooltip showing a screenshot of the link destination. For pages with more than two or three links (read: any useful page anywhere), I can't imagine anything more annoying. Kill them. Kill them all. Right now.
(And don't tell me I can disable it with a cookie. Don't enable it by default. Most people aren't as web-savvy as you think they are.)