Other
Applied Thermodynamics: Heat Transfer
Heat transfer, rates of heat exchange,conduction, radiation and convection are defined and discussed at this site from Applied Thermodynamics. Well illustrated.
Other
Third Millenium Online: Melting and Freezing
The concepts of melting point and freezing point are explained on this site.
University of Sydney (Australia)
Equations for Thermodynamics
An exhaustive list of equations and formulas which are commonly used in thermal physics (including equations for triple point). Equations are organized according to category. Meaning of the symbols is clearly stated.