Knees going in
If you have this problem, you just really need to concentrate on forcing the knees out on each set. When you do the squats get easier, you will feel stronger because it lets the more powerful muscles do the work. If you have a training partner you can have him put a belt or rope or string or something around the outside of your legs for tactile feedback when you are setup to squat.
As for glutes and the rest of your posterior chain, do reverse hypers. Testosterone.net has a good article someplace showing ways to improvise if you do not have access to a regular reverse hyper bench. And I like high rep sumos for glutes, but keeping your form is hard on these. Just do a max rep set of sumos and your glutes will hate you. Glute ham raises are nice too if you have a GH bench. I need to get one. I used to belong to a gym that had them and I liked them alot for the hamstrings.
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