Just came across this product:

http://www.prweb.com/releases/Droll_Yankees/Ant_Moat/prweb12685768.htm

What a great idea!  Every year, late April, we start to see ants in the house.  We spray outside around the foundation and it ends, but they are ALWAYS an issue around my hummingbird feeder.  I usually put some pesticide around the base of the pole that holds the hummingbird feeder, but that only seems to help for a day or two.  The solution? This ant moat may just do the trick!  I do believe I will have to order one….