Conversion Optimization: Psychological Tactics
nickkolenda.com
nickkolenda.com
(That's only my opinion. Perhaps I'm just on the wrong side of the statistics.)
Also, I think tactic 18 is illegal in the UK.
Basically, anything that involves pre-selection or requiring someone to actively opt out of something that will cost them money is likely to be on shaky ground (as, IMHO, it should be).
In all my time working in e-commerce I have seen no evidence that basic UI changes such as wording, button colours, small page layout changes etc. provide any measurable uplift in actual conversions.
The only way I can see that a change in colors or wording would provide a lift is if the original was confusing, which shouldn't be the case.