I\'m doing this for a project in AP Computer Science.
Basics:
Mac OS X 10.5.8
NetBeans 7.0
Android SDK 3.0 (Level 11)
So I\'m
Get Android plugin for NetBeans and then you will be able to open these project and play with them. The project home page is http://www.nbandroid.org/
Some initial steps may be needed. Set up SDK location in Tools | Options | Misc | Android. Then check that your project has some build target set in (select project, r-click and go to project properties). Once the build target is set plugin will (re-)generate build script and required .properties files. You'll be able to run build then.
-Radim