Creating panels styles can be very powerful. You can define certain styles for your client to choose from, so they can choose what type of display the panel pane will be like.
A common requirement for many of my recent clients has been to move the "Read More" link at the end of a teaser inline to the end of the teaser's last paragraph. Like this:
SEO is one of the more critical aspects for any web site - at least if you want to be found in the search engines. The fact that Drupal is capable of being super SEO friendly is a great benefit.