My second attempt...
Here's my second attempt at sourdough bread. Hanging out below is its cousin, a curling stone. ;-)
As you can see, I have zero oven spring. The crumb is a little gummy. I'm pretty sure I over proofed. On the upside, it has a nice flavor and the crust is crunchy/crispy.
I'm using the recipe for basic sourdough bread from The Bread Baker's Apprentice. I grind my own flour and this attempt is hard white wheat.