Apart from the webpages you mention, there's also Douglas Hofstadter's book Gödel, Escher, Bach. For perl specifically, there's my Short quines.
Update: These days I also started to like quines that look like this:
Update 2010-01-28: These unpack quines by mtve below are nice. Here's my attempt.
print unpack a44X44a43xaXXaaXaXaxaXaX4axa, "print unpack a44X44a43xaXX
Or, if you don't need the newline, this works too.
print unpack a35X35a34xaXXaaXaXXa,"print unpack a35X35a34xaXXaaXaXXa,\
Update 2012-12-12: see also General quine, Short quines.
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