www.occash.com - has 2 awesome BBW sites and they are out top converters
www.brickhousebutts.com and
www.phatblackfreaks.com
www.lordsofporn.com - has 1 EXTEME BBW site, also out top converter
www.fatandchunky.com
The moral of the story, I guess people love fat chicks!
Try them out, I think you'll be happy with the results.