For more information on various aspects of colour please have a look around my website:
Also, the American illustrator James Gurney (author of the Dinotopia books) maintains a very active blog on many aspects of painting, including colour:
There are a number of good forums where you can post your work for discussion and critique. This is one of the best:
Finally, if any staff (or students over 18) are interested, I'll be teaching two 5-day workshops in colour theory and practice over the summer break (December 27-31 and January 17-21 ). Book ASAP if you are interested.