Linux has perfectly good fonts these days, and they are getting better.
Patents held by Apple Corporation did not allow basic technology (the Bytecode Interpreter)to be implemented in Linux fonts (without paying). FreeType (the Linux font system) worked around this and things were workable, but still, having the Apple technology would have been better. But now….
As of May 2010, those patents have expired and as of July 12 with version 2.4.0, Freetype ships with the Bytecode Interpreter enabled. Version 2.4.1 was released July 18 to address a small bug found in 2.4.0. Freetype is released under a BSD-style FreeType License and the GPL.
Bwahahaha!!! The patents always expire, the dam always breaks, the grip always loosens. Bwhahahaha!!!