There is so much to light wind sailing that it can fill a whole book. One of the best books on the subject, and lots of other interesting stuff, is Frank Bethwaites "High performance sailing". If you can chew trough and understand what he writes in the first section of his book, you will know most of what there is to know on the subject. I have read trough his weather section lots of time, but I still find new and interesting things there.

General advice, keep to the edges as you are likely to find more wind there. Keep an eye on the locals <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" /> and try to find a system to the puffs. Often there is some kind of system to it.. Go to the wind if possible, and try to map a route trough the puffs to the finish line. Often you can see the various areas with pressure and all you have to do is link them up before they die. Good sunglasses with polarized lenses can help if you know what to look for.