Maybe, there are others. I could likely extend the list to double if I put an effort towards it. Simply realize one uses the methods that work for them. Many of these are not routinely used by anyone, much less myself. My main personal methods have been owning multiple resorts for the 11 month window, Sun-Fri, trading in through II, staying at OKW and reserving early. Then for timeshares in general I've moved to a own to use and trade for variety/sport approach then rent out off years whether it be DVC or Marriott. My methods will change when I get down to just the 100 AKV points and some of these issues may be more important to me personally.
And my number one tip is to learn any system well and be willing to put the effort into playing the game. For example, I was up to almost 1 AM this morning making my first class frequent flier reservations for HI for Jan-Feb, 2008. So I have currently FF tickets first class for 2 to HI with a Marriott hotel reservation at the Waikiki Marriott for a week using reward points followed by a 1 BR exchange to the Westin on Maui (gotten with an exchange that cost me only a few hundred $$$ total). All I have to do now is one night in between on priceline, a rental car for Maui and ? Oahu and interisland. Plus my favorite travel activity, planning restaurants. Total cost for the trip including indirect timeshares costs about $2000-2500 out the door with food and activities.