Yeah, stuff happens.  If you read the sidenotes in BBA he talks a little bit about breaking oven glass.  Fear not, it really isn't the end of the world.  Check out the appliance parts suppliers on the interwebs, they also offer advice on repairs,

mike

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Redundancy is your friend, so is redundancy

Peter Reinhart in the BBA warns that one must cover the oven door's glass window with a towel when you are adding water to the hot oven, noting that just one drop of water on the hot glass can cause it to crack. Perhaps this is the cause of the cracked glass? An oven temp of 500F wouldn't cause it on its own.

What brand oven is it and how old? You should be able to just replace the door. You might try contacting the customer service rep of the manufacturer, or a local appliance company to find out the costs. Then tell your hubby that you'll bake him a yummy loaf of bread in exchange for his labor in removing the old door and installing the new.

I don't know how long you could get away baking without fixing the problem. You will be losing heat because of the cracks and I'd be concerned about it shattering at some point. Perhaps we have some glass gurus here who could help.

Good luck!

has some tips about taking the door apart and putting it back together.

First remove the door from the oven, see manual.

• If your door is put together with stainless steel screws (check with a magnet, good ss will not stick), use a stainless screwdriver or cover the tip with a piece of cloth to keep the different metals from rubbing together.  
• If the screws seem to be all around the outside of the door, think of the door like a clock and remove 12 o'clock, then to the opposite side 6 o'clock, 3 o'clock, 9 etc, always working opposite sides as much as possible,   till all the screws are removed.  Take note of any screws being longer.
• When putting back together, the same, working opposite sides, only don't tighten completely until all the screws are in. 

Mini O

SYLVIAH   Depending on your ovens age style, make, hopefully it will remove easily.  I was surprised when reading my instruction book on (cleaning) my ovens that the doors remove without any tools...they are pretty heavy.  My ovens are about 7 years old. 

This happened to my oven also.  It was from creating steam (heating a pan and dumping hot water into it).  The problem is not getting the door fixed (could get expensive if it cracks everytime you make steam), but it's how are you going to create steam if your oven door cracks whenever you make steam (could get expensive).  I thought of just humidifying my oven instead.  I know there's a thread on here about humidifying vs. steaming, but it wasn't much help.  Has anyone humidified their oven and achieved results similar to making steam?

If it is like my old gas oven, it has an inner and outer glass.  My inner glass broke while steaming a loaf of bread, and I used it  (not ever steaming again!) for about 3 years with no problem.  They are made with tempered glass and can stand up to pretty high temps, but as mentioned above, don't do well with moisture.  I felt safe continuing to use it since it had the outer glass, but you should be careful.

I guess this is a pretty good reason to keep liquid water away from the oven.  The ice cube and cast iron fry pan method is somewhat better in this aspect though I've had ice cubes skittering around the oven on more than several occasions. 

The best method is to use an earthenware "cloche" soaked in water prior to covering the bread for baking.  Using a regular stainless steel bowl or pan is a good alternative.

Wild-Yeast 

I am sorry to hear about that, considering your passion for backing this broken glass is NO good news... I don't know if you can replace the door, it depends on how old is your oven, I suggest you to check for some appliance manufacturers, perhaps they can provide you a reliable solution... Gordaman at Maytag Parts