Fonts Common to all versions of Windows & Mac

Windows Font Mac Font Font Family Font Call with defaults for both OS's
Arial Arial, Helvetica sans-serif Arial, Arial, Helvetica, sans-serif
Arial Black Arial Black, Gadget sans-serif Arial Black, Arial Black, Gadget, sans-serif
Impact Impact, Charcoal sans-serif Impact, Charcoal, sans-serif
Lucida Sans Unicode Lucida Grande sans-serif Lucida Sans Unicode, Lucida Grande, sans-serif
Tahoma Geneva sans-serif Tahoma, Geneva, sans-serif
Trebuchet MS Helvetica, Charcoal sans-serif Trebuchet MS, Helvetica, Charcoal, sans-serif
Verdana Verdana, Geneva sans-serif Verdana, Geneva, sans-serif
MS Sans Serif Geneva sans-serif MS Sans Serif, Geneva, sans-serif
Georgia Georgia serif Georgia, serif
Palatino Linotype, Book Antiqua Palatino serif Palatino Linotype, Book Antiqua, Palatino, serif
Times New Roman Times New Roman, Times serif Times New Roman, Times, serif
MS Serif New York serif MS Serif, New York, serif
Comic Sans MS Comic Sans MS cursive Comic Sans MS, cursive
Courier New Courier New, Courier monospace Courier New, Courier, monospace
Lucida Console Monaco monospace Lucida Console, Monaco, monospace
Symbol Symbol Fantasy Symbol
Webdings Webdings Fantasy Webdings
Wingdings Zapf Dingbats Fantasy Wingdings, Zapf Dingbats
source: http://www.ampsoft.net/webdesign-l/WindowsMacFonts.html