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POPSCSS from the Ground Up great article - starts at a very beginner level but explains even more complex things in a very nice format
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POPSThe Power of CSS Zen Garden has fantastic examples of just how powerful CSS can be. Take a peek , freakin amazing work.
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POPSgotApi - api browser Click on one of the language/applications to render a browseable tree of documentation/api. e.g. generate a list of every oracle error code
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POPSIs Your Web Site Accessibility Friendly? Interesting article of information on accessibility brought back into the limelight. I think if this were thought of as "accessibility can fall into the loop of censorship" ... in a figuratively speaking way, it might be easier to remember while planning our websites, whether we've covered all viewing and accessiblity options. For example, is it viewable with Firefox? IE? Opera? and by the Blind? (just some thought examples and not meant to limit or exclude any other human challenges such as age... uhum. ;) )