I just noticed two newer documented chart types. They can be used to generate Google-o-meters and QR codes. http://code.google.com/apis/chart/types.html
You can use "cht=gom" to generate a "Google-o-meter", which generates a gauge with a needle pointer.
example: http://chart.apis.google.com/chart?chs=225x125&cht=gom&chd=t:80&chl=80%+Google
chart.apis.google.com/chart? chs=225x125&cht=gom&chd=t:80&chl=80%+Google
You can use "cht=qr" to generate a QR matrix code (i.e. "quick response" 2-D "bar" code). This can encode up to 4296 characters. A decoder application that can be used with a camera phone is also available. If the encoded text is a url, it may be treated as a link by the decoder.
QR codes: http://www.denso-wave.com/qrcode/aboutqr-e.html decoder: http://code.google.com/p/zxing/
blogoscoped related: http://blogoscoped.com/forum/73431.html http://blogoscoped.com/forum/137633.html#id137648
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