Links:

Crux Mathematicorum with Mathematical Mayhem. 
Bernard Gibert's Cubics in the Triangle Plane
Dick Klingens' Geometry site [in Dutch].
Hyacinthos group on Triangle Geometry.
Kimberling's Encyclopedia of Triangle Centers.
POLYA: Cooperative Solutions of Difficult Problems in Elementary Mathematics

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Last modified by Paul Yiu, Ootobter, 2003.