I have a 6,1 White iMac with 2x2GB RAM Modules installed. As soon as I start giving the computer a heavy workload (Large Images in PS CS3, Picasa, Firefox and iTunes open at the same time) I see the Free memory reduced and Inactive Memory never freed, and I have to apply the "Repair Permission" trick to free the inactive memory. Will moving up to Lion fix this memory leak or am I to see this issue in Lion too. Unfortunately adding more RAM is not an option at this time, as the White iMac is topped out at 3GB. What's you experience so far?