Okay, I'll chime in while we're waiting for Littledog. When I do this boost-a-narrow-Q-and-sweep thing, I usually boost to about 10 dB with a Q of about 12. Then I sweep. If a frequency is really problematic, it'll just jump out at you with an ugly sound. But when I learned how to do this, I got overenthusiastic about it, and started sweeping *all* my tracks and cutting every frequency that sounded less than sweet. See, when you start doing this sweeping thing, you'll find frequencies that sound kinda unusual, although they're not really ugly. Anyway, one day I compared a mix where I'd been sweeping enthusiastically to one where I hadn't swept at all. Guess what... the unswept mix had way more life in it - I'd been sweeping the life out of the other mix.
Anyway, I've got a theory about sweeping for bad frequencies. It's a useful tool, but it only applies if you've miked something poorly. If you mic it right, there's no need for that surgical EQ work.