How can Jupiter and Saturn affect the timing of solar cycles?: Brief review

http://tallbloke.wordpress.com/2012/03/22/how-can-jupiter-and-saturn-affect-solar-cycles-brief-review/
According to what we know so far, if the motion of planets is affecting solar variability as the myriad correlations which have been discovered suggest they are, then it must be via one or a combination of the known forces: Gravitation, Tides, Electromagnetism.