Here are some (very) useful links to reference material, tools etc that are good to have in one place when developing Android apps:
Programming Guide For Video-Gamers - http://ithare.com/programming-guide-for-video-gamers/
(Thanks for the tip, Dylan and Tracy)
Online syntax highlighting for Java - http://tohtml.com/java/ (I'm using style: navy)
Icon Design Guidelines - http://developer.android.com/guide/practices/ui_guidelines/icon_design.html
OpenGameArt.org - http://opengameart.org/
Sketch & Paint! - http://www.onemotion.com/flash/sketch-paint/
Publishing on Android Market - http://developer.android.com/guide/publishing/publishing.html
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