As you may know, the methods for increasing you intelligence have over the past couple decades turned into a business. People like Paul Scheele and businesses like Volition Thought House have created products that claim to help you achieve genius through the power of your mind.
The problem is that some, and if not most products, are not as effective as the producer claims. Some people go so far as to claim the technique called 'photoreading,' as introduced by Paul Scheele, is a complete scam (cite). People also are skeptical of a technique called 'image streaming,' whose discoverers claim that it will increase your IQ as well as your ability to speak and write (See: "The Einstein Factor" and The Mind Accelerator). Furthermore, even programming your subconscious with positive affirmations is also criticized as being ineffective (See: Floppybait's comment(s)).
So how effective do you guys think these strategies (and any other one's I haven't mentioned) are? As author and astronomer Carl Sagan says, "extraordinary claims require extraordinary evidence."