WebKlipper lets you easily, without requiring registration, annotate any webpage with virtual post-it notes or a highlighter. You’re then given the url address of the annotated webpage.
It’s quite easy to use. However, as far as I can tell, it appears that anyone can then remove your annotations. I may be missing something, and have emailed the site to find out if I’m correct. If that’s the case, it makes a problematic for student assignments that would be posted on a student/teacher website/blog.
Nevertheless, it’s a nice app that I’m adding it to Best Applications For Annotating Websites.
Thanks to the Make Use Of blog for the tip.