I've done every battery/power hack I can find! lol
I've done lots of file system tweaks, memory, optimized registry, internet, and lots of hacks to improve speed and add/unlock functions. I made a theme, got a new taskbar, keyboard and I have removed a lot of bloat and I'm pretty happy with it so far.
I'm trying to learn as much as I can about it like I did with the Vogue.