Comment on wClock

Obviously ood / abandoned (not updated since 2003). Download still available here: http://www.macupdate.com/info.php/id/13297/wclock . Works under 10.6.0 for me.

However, there are almost a dozen alternatives with more functionality out there, e.g. MenuCalendarClock, MagiCal, iClock Pro, tinycal, MyMenuDate, iStat Menus... just look here:
http://osx.iusethis.com/search?order=users&q=tag%3Acalendar+menubar
http://osx.iusethis.com/search?order=users&q=tag%3Acalendar+menu