I often see students who have a pile of hard-copy print-outs from the Web, and they’ve used a yellow or green highlighter pen to mark useful paragraphs or phrases. What if they could do the same for Web pages? There’s a Firefox addon, Wired-Marker that does just that…
Wired-Marker is a … highlighter that you use on Web pages. The highlighter, which comes in various colors and styles, is a kind of electronic bookmark that serves as a guide when you revisit a Web page. The highlighted content is automatically recorded in a scrapbook and saved. … the highlighted sections remain visible on the page when you revisit … Wired-Marker is freeware … sponsored by the Ministry of Education, Culture, Sports, Science and Technology” … “You can also add notes to the bookmarked items.”
Sadly, it doesn’t yet work in Firefox 3.5, and the last supported version was Firefox 3.1b2.
Update: now working with Firefox 3.5!