Last year, Google replaced SearchWiki with starred consequences. You only had to click on a star to bookmark a search result and to rapidly find it later.
Unfortunately, this feature is no longer available and you have to find other ways to bookmark hunt results: bookmarklets, Google Toolbar and other extensions.
A Google employee established this change. "The Star feature no longer exists on Google. The Star function continues to exist throughout google.com/bookmarks though. Anything you formerly starred will show up when you visit bookmarks."
Starred results and SearchWiki were really useful for refinding web pages, but most likely not many people used them. These features were a lot more helpful than Instant Preview, which is still available.