Alright, went googling this morning and found some cool information. Here's the link: http://www.shapefit.com/periodization-t ... kouts.html
Its got some interesting study results written in there, its pretty easily read too. I thought the strength gains between the two sets of people one using periodization and one not was pretty impressive. 27% gain over just 6%?? Talk about time better spent by resting :-) The other thing that was pretty impressive were the strength gains by various level of athlete, which would explain why Cheapo has been at level 7 for awhile.
"Various studies have found that muscle strength increases by approximately 40% in untrained individuals, 20% in the moderately trained, 16% in trained, 10% in advanced and just 2% in elite level athletes over periods ranging from 4 weeks to 2 years."