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Biochemistry free and easy
Kevin Ahern's and Indira Rajagopal's excellent and free biochemistry textbook
pathorama.ch
A high-class website with a comprehensive, well-organized collection of slides for histology and histopathology
TeX StackExchange
A very well-organized and comprehensive question-and-answer site for all things LaTeX—I use it often
mychemistry.eu
Clemens Niederberger's useful collection of LaTeX packages and related links for chemistry
Chemfig
Christian Tellechea's outstanding LaTeX package for drawing chemical structures. Comes with clear thorough documentation