Being accustomed to Windows I use reboot the PC at the least every few days. And I've certainly read of and been told of Mac users sometimes rebooting as infrequently as once a year. So long as there are no problems with the OS (I'm using Snow Leopard), is it okay to not reboot until slowdowns or problems occur, even if that means you haven't reboot for as much as a year? I ask this as I wonder if perhaps minor issues could be accumulating in the background that may not necessarily manifest into problems evident to the user over such extended usage. Or perhaps memory leaks. For example, I notice the memory usage of Firefox over the course of the day goes up to nearly 1gig. I don't notice it slowing down the OS or Firefox, but I do usually restart it at some point during the day so it goes back down. I like to inspect the data from Activity Monitor, leaving it on and visible in the Dock, and I notice that the amount of "Free" memory at the start of a fresh boot is still always a good bit more than the amount of Free memory after some hours of use (even after I've closing all open programs so the number of processes open then is the same as during a fresh boot). So I also wonder if the amount of "Free" memory will continually, however gradually, diminish through weeks or months of simply putting the Mac to sleep? Thanks for any insight.