That's really impressive!
How long have you been lifting? How much did you weight before you started?
I've been doing squats for quite a while, over five years. I had done deadlifts occasionally in that time frame, along with various other things, but no regular regimen. I didn't get 'serious' about a program until around six months ago. (June 8 was the first day I started the new lifting program.) Before the program I would squat up to 225 lbs (two plates on each side of the bar), and occasionally go up to ~20 lbs higher. However, I don't think my form was very good.
Before starting the program I weighed about 215 lbs. A month or two after the program, my squat got up to 315 lbs, and my weight jumped up to 225. Being that heavy made me really slow for volleyball (along with lots of ankle pain jumping and landing), so now I'm trying to cut down to as light as I can be while not losing too much strength.
My form was better (I think; hard to judge these things), but I still could not get as low as I want to. I have an issue with ankle flexibility, so it's basically impossible for me to do a complete 'ass-to-grass' squat. However, if I take a wider stance, focus on keeping knees out and warm up hip flexibility, I can get fairly low, significantly below parallel. So that's what I'm working on now; I dropped down to 275 to make sure I go absolutely to the bottom on each rep, and am working back up to 315+.
The program includes all the lifts I said before. It's called Stronglifts 5x5, and is basically designed for beginner lifters to get them to an intermediate stage. My start -> max progression was basically:
squat: 225 -> 355
deadlift: 225 -> 315
bench press: 135 -> 190
overhead press: 65 -> 115
barbell row: (never did before) -> 155