ray1408:
Hi,it seems that Sparkfun has recently updated its collection. There is a new 3.3V 8Mhz board available (http://www.sparkfun.com/products/11114) that replaces the old one (http://www.sparkfun.com/products/9220). The description might allow the conclusion that the bootloader has been changed since no reference is given anymore to the Duemilanove w/ 328.
Or that "Pro Mini" was added to boards.txt. Maybe it wasn't there in some earlier version. Which Pro Mini version do you have? Either way, I don't see how it could make a difference.