Snopes disputes the '12-ft, 1,000 lb' description as well:
http://www.snopes.com/photos/animals/hogzilla.asp
and has some more background, tho' they don't doubt that a really, really big porker existed.

Now I can't wait for the PeTA folks to have their say.

I guess I missed, in the articles, what exact weapon the guy used to fell the beast. Anyone know?