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most synth/multi-sample sounds don't need EQ'ing, maybe a bit of shelving or shaping and that is all you ever really NEED to do cos the factory have removed any harmful/unpleasent freqs before hand.

When using freshly recorded instruments/vocals, that is probably the instance you'll need to use most of ur EQ'ing skills. As for ur tracks sounding "2d", try compression after to bring out the track if you feel it looses its pressence or use a stereo imaging plugin to give the sound space in the stereo image.

That's my 2 cents

sorry to bump an old thread but i remembered it after reading these two awesome articles.

first, a text from 1979, which is a rather basic, but oh so well written article on different eqs and some fundamental techniques:
http://www.ethanwiner.com/equalizers.html

then, an article by the same dude that explains his views on the eq/phase thing:
http://www.ethanwiner.com/EQPhase.html

the phase article really explains how an eq works and where the phase shift comes from - something i never figured out before.

now, whether or not you agree with this guy on phase problems being a myth or not, these two articles are a great read. they made some things much more clear for me and gave some food for thought too.