I've just ordered "The New Rules of Lifting for Women" and have flipped through it at Borders. It makes a LOT of sense.
The jist of it is, to make maximum gains in a short time, do total body workouts intensely 3 days a week, and interval cardio 3 times. So legs would be 3X a week with cardio in between.
The book also basically says to do big movements, like squats, bench presses, etc and not to waste time with "small" exercises, like tricep kickbacks, and leg floor work. Alwyn Cosgrove is the guy behind the weight work theory, I've been reading his blog, and like I said it makes a ton of sense.
Years ago when I did the FIRM, it was total body 3x a week, and within 6 weeks I had a new body. Of course I went and ruined it again

but I'm back on track now with Cathe. Going as HEAVY as I can, total body workouts. I'm going to the beach in 3 weeks, hopefully I'll see a difference!