A comparison of MPPT (Maximum Power Point Tracking) and PWM (Pulse Width Modulation) charge controllers. The article suggests that although MPPT will maximize the transfer of solar power to a battery, the PWM will will optimize battery life.
A general overview of solar panel charging systems for a boat
Unmoderated forum on marine electrical and electronic equipment. Good advice and resources here, but you have to dig and you have to be selective.
A list of pros and cons for these two types of solar panel from a small-boat circumnavigator and life-aboard.
A discussion board and photo gallery for cruising sailors and wannabes focused on the best ways to generate, distribute, and control electricity on a cruising boat.