Kottke tweeted earlier a link to some ridiculous password requirements which were all pretty funny in itself, but he also linked to some tips on how to select passwords that are actually secure. Everyone will be making fun of the guys that come up with those list.
But, Kottke also links to a great, insanely great, article on how to select passwords that are actually secure. How secure? Yeah, it shows you that too. Absolute required read for anyone doing anything online.