Hi All, thought I'd share this with you:
Has
THIS 
ever happened to your mirror
???
1. Of course, you'll need to purchase your glass mirror from a source. I got mine from:
Pacific BMW
4648 San Fernando Rd.
Glendale, CA 91204
1-800-909-PART
If you call them on thier 1-800 line, you may not get a quick answer... maybe it was just me, but calling them on the other lines will give quicker answers. Have your model information with you and make sure that your getting the correct glass, ie, heated, etc.
(
You dont' have to get it from them.... there are other sources out there.)
Ok, now it's really simple, but don't forget, your dealing with glass so you should be a bit careful.
2. Get some sort of lever, I read somewhere that you could use a screw driver, wrapped in thick tape to prevent any damage to your mirror's trim.
3. Now stick that lever into the bottom edge of the mirror glass.
Carefully pry the glass out towards you. Being that it is cracked and flexible at this point, it may behoove you to wear safety glasses. It doesn't take alot of effort, just enough to loosen the clips holding in the bottom edge. Once loose, it'll just pop right out.
4. Get the new glass and align it so that the electrodes for the heated mirror option (if you have that) are aligned to the wires in the mirror assembly.
Now, plug them. If you have pudgy fingers like me, hold the mirror in your left hand and use your right to plug them in (assuming your installing the driver's side mirror, if passenger, opposite).
5. Now just jimmy it in until it's firmly in place.
WALLA! All done! Simple eh?
Hope this helps someone in the future, Good Luck! (not that you'll need it),
Dough