I changed the sugar water out in one of my feeders yesterday and moved it to a more visible location. It paid off!
Ruby-Throated Hummingbird: spotted 5/29/12 in the side yard.
Hummingbird Food Recipe:
1 part sugar to 4 parts water.
Boil for two minutes exactly, stirring to dissolve sugar, then allow to come to room temperature.
Replace often - they like it fresh.