For 2 months I was falling over - and over - and over. I put a post here and got some excellent advice. The thing that made it work for me (thanks sooooo much for the advice tctrek) was making sure both brakes were fully engaged before unclipping my second foot (I unclip the left first). For some reason after I stopped I was letting up on the brakes and starting to roll a little which resulted in a sort-of panic move and a crash. I didn't even realize I was doing this until I started paying attention to my braking while clipping out. I guess I was so focused on my feet I totally forgot about what my hands were doing. I haven't fallen since (knock on wood) but I still have to think through the entire process every time I come to a stop.

The bottom line is although it hurts to fall over - you have lots of company and you will eventually get it.