North American Fruit Explorers mailing list at ibiblio

[Lucky Pittman <lucky.pittman@murraystate.edu>]

There was a lengthy discussion - it may still be there - on the 
GardenWeb Forums within the last year or so on squirrel elimination 
and one other particularly effective method was the 'Bucket o' 
Death'  - a large trashcan, filled about half-full of water, with 
sticks leading up from the ground to the rim, and another stick laid 
across the top.  Then, sprinkle a layer of sunflower seeds over the 
surface of the water.  When the squirrels bail off to get some seeds, 
they're trapped and eventually drown.
Is it humane?  No.  Is it effective? Yes.
They're vermin.

Another method that's been purported to be effective is to fasten two 
boards together in an "L" shape, with the horizontal leg 3-4 ft long, 
fasten this to the trunk of a tree, and screw one of those big rat 
traps to the far end.
When ol' Br'er Bushytail comes gallivantin' down the trunk of the 
tree, he's just GOT to run out to the end of that board to 
investigate, and SNAP!  you got him.

LLP