Spare Parts worked fine when I tried it.
I recently set an all black jpg as wallpaper which reduced the screens battery usage from an average of 56% to around 37%.
I disabled wallpaper scroll via Home++, which made navigating between screens much smoother. I also keep the display brightness off when inside or in low light places.
So far battery is at 68% 18 hours after unplugging but with quite low usage (~10 sms, couple of phone calls, browsing the market and updating a few apps).
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