Is there a way to remove the shadow bar that's behind the icons in the quick launch bar?
there's a patch called "Hide Quick Launch Bar" which still shows the wave effect of the icons but has no background shadow.
Palm Pre (Sprint)
If you'd like to keep the buttons but make the quick launch bar transparent, you can find a file here, and copy it to your Pre:
Everything's Amazing and Nobody's Happy
Treo600 --> Treo650-->PPC6700-->Treo700P-->Treo755P-->Treo800W --> Touch Pro-->Palm Pre --> EVO 4G