The title is a little misleading, but appropriate for the subject. I am a huge user of ‘less’ to view logs files. While most of the users in my office are chemically addicted to ‘tail -f’. They just can’t seem to wrap their heads around the idea of a basic text viewer that can tail (follow), search, mark, and insert line numbers if you want. If you want a full run-down on what you can do with less go here: http://linuxaria.com/howto/bash-linux-less?lang=en. It pretty much outlines all the really useful options for less.
If you aren’t using less, you should be.