I recently gave a presentation on Install Profiles in Drupal 6 and 7 at the Broward County Drupal Users Group. I use Install Profiles in conjunction with Drush Make in order to speed up development times, and automate as much repeatable steps as we can so we can focus on the custom work each website needs.
Frequently Asked Questions, or FAQs, as they're affectionately known, are a staple on the majority of informational and e-commerce websites. You can find them on a wide range of super popular sites, from Newegg to Digg, from Myspace to ABC.
As your freelancing and studio work progresses, you eventually will have a body of work that you'll be able to pull from in order to woo potential new clients. There is a tendency for all of us to show our entire body of work. This gives the impression of more experience and a wider variety of work, so that potential clients from all areas will be more likely to choose you. However, is that what you really want?