1 - Whois
Whois-record (site owner) lookup of the current web site.
2 - Internet Archive
Archive lookup of the current web site with archive.org.
3 - Cache
This bookmarklet shows a cached version of the current web site. Useful for temporary offline sites.
4 - Plagiarism
Copyscape provides a free plagiarism checker for finding copies of a web pages online.
5 - Images
ImgOps is an image operations meta-tool.
6 - Print and PDF
PrintFriendly's bookmarklet cleans and formats web pages for printing and creates PDFs. You can try its funtionality by clicking on the PRINT/PDF button in the right upper corner here on this web page.