To install a bookmarklet, DRAG one of the links below to where it says "Links" on your browser's menubar (upper right). A new link ("Check OED" or whatever) will appear under the Links feature. If you don't see 'Links', place the cursor someplace in the menubar area, right-click to display menubar options, and check the Links option.
On lab machines you'll have to add bookmarklets for each session, at least until we figure out how to make them stick...
Here's one that looks up a highlighted word in the Oxford English Dictionary [OED] (or click on the bookmarklet to open a box to type a search string into --a shortcut to the OED) :
...and here's one for a Wikipedia search --again, highlight a word on a page:
and one that does a simple keyword search in Science, Oct 1995 to the present:
This one is a shortcut for a Google search:
...and here's one that does a Google linkback, found at Backlinking Through Blogspace With Bookmarklets (Robert J. Seymour)
...a larger conversation, the collective thread of other webloggers who commented on the same stories (parallel links) or pointed to the post you're reading (backlinks). ...The backlinking bookmarklet just tells your browser to open up a new [page] that brings up a search page highlighting backlinks for the page you are currently viewing...
Read more about this on Jon Udell's Library Lookup blog page