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Tested with jQuery 1.2.3+ in: IE6/7, FF2 (Windows XP), FF2 (OS X), Safari 2.0.4
NOTE: Unlike any other "onfontresize" technique I've seen, Hedger's doesn't use a setInterval-style polling mechanism to detect the font size. Instead, it leverages browser native onresize events that are fired when a hidden iframe is sized in ems.
KNOWN ISSUES: Depending upon how the base font size in your document is specified (em, %, or keyword) the "pixels per em" calculation may not be consistent across browsers. Also, the event doesn't fire in IE if fonts are sized in px units.
» Download jquery.onfontresize.js