Janedo currently has a nice entry on her blog about sourdough starter feeding and sourdough baking during the heat of Summer. (It's in French, and I haven't checked the English version.)

Anyway, Jane offers some good things to think about as the weather heats up. (It's 106F where I am today.)

Here is a link:

http://aulevain.canalblog.com/archives/2009/06/22/14168757.html

Enjoy!

David