Thanks, again, everyone for the helpful information. I'm recovering strength in my glutes and right leg, although I have a way to go. I'm also getting back into doing Pilates a few times a week (not at a studio). Mari Windsor has a new beginner's pilates DVD out that really focuses on proper technique. I've discovered that the key is really finding and activating my glutes is following her tips for activating your powerhouse.
Like bluebug, my glutes are getting noticeably larger and firmer. Bootylicious. haha!