Shriver & Atkins: Inorganic Chemistry 4e
Chapter 07
3D Exercises in Point Group Symmetry
http://www.ch.ic.ac.uk/vchemlab/symmetry/
The 3D structures may be helpful for those struggling to identify symmetry operations.
Symmetry Tutorial
http://www.otterbein.edu/home/fac/dnhjhns/symmetry/intro.html
A basic symmetry tutorial.
Normal Modes of Vibration
http://cat.middlebury.edu/~chem/chemistry/ch2cl2/vib.html
Further detail on the symmetries of molecular vibrations.


