Many programming environments have a feature called "flags", that allows one to mark lines of code, and jump to them when required. This is a brilliant, and could be extended to the web. Those of us on dial-up connections often view the "printable version" of a web page, so that we can read offline at our leisure, instead of clicking through a paged article.
The problem is that printable versions are long and it is easy to lose one's place in the article. I wonder if would be possible to add a feature that replicated the flags feature for web browsers?