Congrats on your success!
Yes, this is what I keep reading - lower weights and higher reps.
I often visit the Video Fitness forums and they're super-helpful. Here's what was recommended for lengthening/slimming & toning muscles. I have lots of recommendations for all sorts of problem areas - back fat, arms, you name it. The older I get, the harder it gets. The whole thing really blows. I'm convinced that by the time I'm in my 60s, I'll have to limit myself to 3 jars of baby food a day. I'm 45 and it's much harder than it was in my 30s. Until then, I could eat what I want and exercise a lot. Can't get away with that anymore.
If you use weights, the focus should be on using relatively light ones with more reps.
Barre Workouts
Callanetics
Ellen Barrett DVDs – Ellen’s focus is always on lengthening and toning.
Karen Voight's Total Body Training
Pilates
Slim in 6 is said to tighten and tone without the bulk
Yoga
Congrats to you also!
To me, Ellen Barrett DVDs are the best example of cardio as well as light weights with more reps. I love her workouts. She's all about slimming without the bulk.
Total Fitness DVDs is a great site with video clips, excellent prices, and shipping rates. Use their coupon code: 10off for an extra discount.