Book of Joe just pointed these out. He says that he's seen them in catalogs for years. We've never noticed them before and thought that any of you with exposed brick would find them very helpful.
These snap on to brick walls and support up to 25 lbs. each., so you can hang things without drilling or hammering. The price is right, at 4 for 9.99. Available in brass or zinc.
These can be used outdoors as well, perhaps to sting up some lights for a patio party...
Available from Improvements.