Another tip I learned from our Webmaster, is to use the hot water from your tap instead of using boiling water. The sugar mixture does not spoil as quickly and it mixes just as well as boiling it.
I seem to have the same number of Hummers as usual near the elementary school.
One thing that really works well and was taught to me by Wrightwood is to hum when you are in the presence of hummingbirds. Wrightwood has a plethora of humming sounds he uses....some are soft and repetitive like a Tibetan prayer wheel chant...others like the sound of a Ganges Mantra done in falsetto. It really gives the birds a sense of well being and makes the person watching them feel better. They respond to the hum that you are doing.
You can learn more about this technique at: Humming4Hummingbirds.feather