Good article from Discmakers on Subtractive Equalization.
good stuff here, especially on using the busses properly.
Resources and information (including basic “how-to” tips) for mastering your recordings.
A great chart listing audio frequencies cross-referenced with instruments, vocals, etc. Mousing over different areas of the chart gives you further information on the frequencies and the plusses/minuses of EQing them.
It is also available as a 24″x18″ poster.