Just letting everyone know that the Lightroom 2.0 release doesn't launch in 64-bit mode by default. I just noticed this on the Lightroom forums on Adobe's site. Any newer Mac running the Core 2 Duo or better processors are 64-bit and will gain a pretty large difference in performance in Lightroom 2.0 following these steps. This includes the last few generations of Macbooks, Macbook Pros, iMac, and Mac Pros. Go to applications. Right click on the Lightroom 2.0 package. Go to "Get Info" and then uncheck "Open in 32 Bit Mode". Why Adobe was unable to check if the processor is 64-bit and launch in that mode is beyond me.