Early 2008 mac pro - 8GB of RAM I never saw a reason to run in 64-bit mode before, but I went to download Handbrake this morning and found a 64-bit version. For those who know, at this point is it time to make the shift? What are the advantages and disadvantages? I don't really run Pro Apps anymore (I used to). Aperture once in a while. Mostly iPhoto. I get that most of my apps aren't 64-bit, but is there any reason not to shift my machine/kernel to 64-bit now? Has the time come?