Since we're talking startup sound.
I'm currently running this. I used the files from this to make my current avatar gif
All you have to do is move the files to /data/local
Both the sound and the animation. Pick and choose if you wish.
The sound is the robotic "Droid" from the VZW Droid commericals.
I take ZERO credit for creating the files, just sharing them with y'all
bootanimation.zip
android_audio.zip
For the animation dont unzip, just place it in it's zipped form in /data/local
EDIT:
Oh-and my battery life rocks
