Sitting in a pot in constant rain did no favors to my hydrangea. I think the leaf spots are a fungus, Cercospora. It apparently won't kill it, so I see no need totry any kind of sprays.
I pruned all of the affected leaves, which has the added benefit of improving the air circulation--a contributing factor to the condition. It fortunately isn't affecting the blooms in the slightest!
This page has descriptions of other hydrangea diseases:
http://www.aces.edu/pubs/docs/A/ANR-1212/ANR-1212.pdf
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