Wanted to remove the default underline from the "left" menu without affecting the underlining of other links. Thought there would be nothing simpler, but wasn't sure of the CSS and my search results on the subject in Google took me way off on a series of complete red herrings. Found a nice easy way in the end, but this came from an old CSS stylesheet that luckily I kept an archive copy of. Otherwise, I'd probably still be looking!

/* Force links in left menu bar to appear blue (no underline) */
#left a:link, #left a:visited {
  color: #0000ff;
  text-decoration: none;
}

/* Force "hover" links in left menu bar to appear blue and underlined */
#left a:hover {
  color: #0000ff;
  text-decoration: underline;
}

And I was right - nothing could be easier, "#left" being the left menu region. I'm obviously typing the wrong terms into Google to end up with the convoluted non-solutions that I eventually managed to turn up!