Google has an official bookmarklet itself. It's very simple – it displays a dialog box in which the user can provide search terms. It's a little outdated though, in the times when every browser has a search box right in a toolbar. Below you can find ten unofficial Google bookmarklets.
1. Add to Reader
Adds the current website's feed to Googe Reader/ iGoogle. Note: Site has to have RSS feed and support for feed autodiscovery (in other words a little RSS icon in the browser's address bar).
2. Translate it
Translates the current page into English using Google Translate.
3. Search this domain
Asks you for the search term and searches for it in Google within current website's domain only.
5. Show Cache
Shows a version of the current page from the Google Cache.
6. Show similar pages
Shows pages that Google considers similar to the current one.
7. Show linking pages
Shows pages that link to the current one (or rather, some of them).
8. Domain's PageRank
Shows the PageRank for the current domain (using prchecker.info)
9. Send it with Gmail
Opens a mail composing window in Gmail with the current page URL provided in the mail's body, and its title in the mail's subject.
10. Add to search index
Sends the current page's URL for googlebot to check.
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