Here's whatsnew:
-added new 1541 timing code that fixes some programs that previously did not load, at the expense of higher CPU usage; it is enabled by default, and can be turned on/off in the floppy configuration dialog
-more accurate emulation of television vertical synchronization
-MacOS X build fixes; also added patch for FLTK 1.1.7 which fixes the check callback on OS X
-improvements and fixes in TED video shift register emulation
-fixed CPU I/O port data direction register ($0000)
-the ROM package now includes the 1541 DOS, rather than the 1541-II; however, it is still possible to use the 1541-II by loading dos15412.rom to ROM segment 10 in the machine configuration
-minor optimizations

Get it here:
http://plus4emu.sourceforge.net/

-Trebor