I went ahead and did this change a couple days ago, directly in my N900 as prescribed early in the thread (used Leafpad). Absolutely stunned at the change in phone's battery life! I keep the brightness usually at 60%, turn off the WiFi whenever I'm not using it, keep the GPS off, Bluetooth off, overclocked to 850Mhz using Ideal voltage... and this has had the greatest impact at increasing battery life thus far. On top of that, as others have pointed out, responsiveness of active apps (usually have up to 6 MicroB windows open) has improved. I keep loving the optimizations that keep being posted! Not so much the fact that Nokia didn't seem to do any of this themselves, or that some things don't work quite like they should... but this community has been amazing at improving this device.