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An EL Function maps to a static method. The function is typically defined in a TLD. See the Unified EL Spec and the FunctionMapper class in the JSP 2.1 JavaDoc for more details on EL Functions.
A list of functions built in to the Unified EL can be found here.
EL-functions work very well in JSF, at least with Facelets. See this page: http://www.ibm.com/developerworks/java/library/j-facelets2.html