Hey Ken
Try this:
Narrow stance on squats, hacks, leg presses, etc. - feet and knees as close together as you can. If you have good control, yo can even turn your toes in a bit, although this can be a bit harsh on the knees.
Go deep on the above, as well
Do knee extensions (if knees can handle it) w/o lettin your leg rotate out (no external hip rotation. Keep your toes pointing in. Works very well unilaterally, b/c you can position your body more easitly to keep the hip from rotating out. This one can bother your knees, too. Make sure to get full range of motion, with a stretch at the end: use your rt. hand to grab the left ankle (behind your back) and stretch the left quad. Vice versa for other side.
-Randy