erm...I have a guitar (Gibson) made of Swamp Ash and i was wondering what kind of tonal charstics this wood has.

Im thinking of replacing the pickups, but didnt know if it would be worth it.

Im looking for a very dark sound...so if this is a brighter type wood, ill be going mahogany with some xbuckers.
ash is definitely brighter than mahogany.

fender strats were (still are?) sometimes made of ash. and we all know how DARK strats are.
They're right; ash will give a much brighter sound than maple, mahogany, etc.

Get a mahogany Gibson; so nice.