[Someone have URLs for what TrueType is, etc.? Google suggests http://www.truetype.demon.co.uk/ as one possible site - appears to have a history and other information about the technology. Note that Microsoft no longer provides their set of TrueType web fonts for people to download.
RS: Name of a company (later bought by Microsoft) which produced scalable vector fonts of good quality for Macintosh, later also for Windows. TrueType fonts typically have the extension .ttf. The format is sort of portable so that TTF fonts from large Windows desktops also work well on PocketPCs. I like most the quick reaction: you can resize a font in a Tk widget e.g. with a scale and have it react in about real time.
KPV: Microsoft true type page is http://www.microsoft.com/typography/users.htm .