+ Incorporated .74 MAME core
+ Analog input for pedals is fixed
+ Now uses a graphical progress bar
+ Fixed some problems with vector games
+ Now warns you if the XBOX clock isn't set (this screws up neogeo games)
+ Fixed screensaver bug (disabling the screensaver caused a infinite  'input-eating' loop
+ Fixed problem with 2 bpp paletted PNG files (monochrome screenshots)
+ Many game-specific fixes (thanks to Xboxed and users of the rom status reporting system) 

See the changelog for more details.
Also note that there are a number of roms that are removed from the MAME core in this release. This includes all roms present from 2001 and 2002. We did not remove these on our own, they were removed from the MAME source distribution.