Yes! That is a doubled column! (Whether it is listed or not, I am unsure. It may have been deemed too minor to list on coppercoins.com)
It appears to be so. Such anomalies are really quite common on later Memorial cents, so while nothing that special (IMO), I suppose they could be fun to find.
some folks tried to sell these on Ebay right after they were discovered in 2005 . they never did sell very well so I suppose it's like non cents said too minor. they may be listed in Wexlers files but IMO not worth wasting time on unless the coin was mint condition.
if you could find some of the 2005 DDR coins in mint condition they may be worth keeping. if I'm remembering right there are a few different ones for this year with the column doubling.
Nice find. Are the knees also doubled to the North-NW? It may just be the stains and shadows that I'm seeing.