Those look nice. As far as CTA buttons are concerned, I think this Smashing Magazine article is a good resource:<p><a href="http://www.smashingmagazine.com/2009/10/13/call-to-action-buttons-examples-and-best-practices/" rel="nofollow">http://www.smashingmagazine.com/2009/10/13/call-to-action-bu...</a>
Nice, but when I see something that's labeled "Only 3.5 MB" or worse "Only $29.99" I'm actually less likely to click a given button. This is probably because this kind of language gives me doubts about the intentions of the site owner, since it's marketing speak. And it challenges the viewer's brain to think twice about whether the price tag actually deserves the label "Only". A better alternative would be to just present the facts and leave the hyperbole out entirely.
Great guide, but I wonder what is the authors' philosophy on rendering in plain anchor tags the call-to-action to follow them on Twitter/sign up for email?<p><a href="http://imgur.com/BXIxG" rel="nofollow">http://imgur.com/BXIxG</a><p>Is it to differentiate it from the visually-distracting call-to-action buttons? I suppose a follow on Twitter/email is less important than an actual download