According to All About Fishing  http://www.aa-fishing.com/ the world record for Largemouth Bass is 22lbs - 4oz. and the Massachusetts record is 15lbs. - 8oz.

Lake Boon fishing is still pretty good!

John J. Tierney III caught his 5.5 lb. large mouth bass on 9/27/08

Links: 

Massachusetts Bass Federation http://www.massbass.com/
Cabin Fever Bass Club http://www.cabinfeverbass.com/
MA Bass Fishing Reports http://www.wmi.org/bassfish/reports/massachu/index.html