UPDATE: btw, you can drag any of the bolded links, or the buttons, to your bookmarks directly from this post.
Note: these are listed in order of my personal usage
(Amazon Wishlist: Button Source)
these are some others I rarely use, but might be useful for other people
and I’ve now officially bookmarked all of these, with my add to google bookmarks link/bookmarklet, so that way i can find them all easily when i switch between browers & computers.
if there are other bookmarklets you’d like, just search the website name with the word bookmarklet (ex: digg bookmarklet). and remember to only use bookmarklets that come from reliable sources, as they will have access to your login information from these sites. the best ones are the ones created by or endorsed by the site itself.