Here are three really nice programs I’ve found (or rather, people have pointed out to me) for the Powerbook lately:
iScroll2: Two-Finger-Scrolling with pre-2005 PowerBooks and iBooks at RazzFazz’ Homepage. This is particularly nice, since it is highly configurable: vertical scrolling, horizontal scrolling, circular scrolling (i.e., iPod wheel scrolling), and even tap-to-click mappings. It seems to be a really well done piece of code.
MyBattery coconutBattery at coconut-flavour.com. This is more than just a battery monitor, since it gives some “absolute” information, such as original maximum battery capacity (in milliamp-hours) and current battery level, capacity, charge cycles, and estimated runtime. We all know deep down that our batteries are slowly decreasing in their capacity as they age. This gives a tangible figure for that degradation.
Desktop Manager. I first encountered a virtual screen program like this under HP/UX, and have used similar programs under Irix, Linux, and Windows. This is a particularly nice one, at least in terms of eye candy. Seems stable, and is great for a machine that’s used for development, web surfing, image editing, etc. to keep each activity kinda separate.