Use Anchors in html
My personal gripe with some web sites is the lack of target anchors for hypertext links using the id or name attribute. They are very useful for providing a quick jump/scroll to relevant information, more so when you paste a link into an instant messenger for someone else.
Here is an example of Wikipedia using the id attribute and the : http://en.wikipedia.org/wiki/Computer_science#Applied_computer_science
And the description of anchors from the w3: http://www.w3.org/TR/html4/struct/links.html#anchors
Even more of an issue is for people browsing on mobile browsers with a smaller screens or if you're building you're site to be more accessible. Access keys are useful for helping people jump to relevant information more easily. This is a link to the Web Content Accessibility Guidelines (WCAG) Overview: http://www.w3.org/WAI/intro/wcag.