Not an important question i know but i was downloading some Adobe trials and noticed that all of the Mac versions of the software where about twice as large as the Windows alternative. I've noticed this before but never really questioned it. I assumed it was something to do with the .dmg format but after googling a little i've not found an answer. Out of interest i checked Firefox 3 on OS X and Windows and they were installed at 44 and 27 MBs respectively... So why are Mac apps generally so much larger?