While I didn't think all of the advice was that great (send e-mail in all caps to a fellow employee?), I did rather enjoy the lighthearted tone. And I think #3 is especially valid for programmers who use that extra time for learning new stuff or doing an interesting side project (or even just resting one's hands).
The CAP email will never result in anything good, but yes #3 is how those of us not lucky enough to work at google can implement our own 20% time policy.
