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They are:
Serif: Times, New Century Schoolbook, Palatino
Sans-serif: Helvetica, Arial, Verdana*
Monospace: Courier
Fantasy: WingDings, Symbol
* installed by Internet Explorer 4+
Most of the common Windows fonts have a Linux equivilent:
Times New Roman ---- Adobe Times
Arial ---- Adobe Helvetica
Verdana ---- Arabic Newspaper
Maybe I'll put together a proper list later when I can be bothered to switch the monitors around again.