This week's book giveaway is in the Other Open Source APIs forum. We're giving away four copies of Storm Applied and have Sean Allen, Peter Pathirana & Matthew Jankowski on-line! See this thread for details.
On the Android site in Icon Guidelines it states:
Icons should make use of the alpha channel, and should not simply be full-frame images. Where appropriate, distinguish your icon with subtle yet appealing visual treatment.
How do I achieve this in Paint