There is an available Android Plugin for Netbeans provided at http://undroid.nolimit.cz/. Like the Android plugin for Eclipse, you can develop Android application in Netbeans and test it using the Android Emulator included in Android Developer Toolkit. I am not a big fan of Netbeans but I gave it a try. It seems that the current version does not support the latest release (m5) of Android SDK. I have not searched further though. Here's a screenshot provided at the Undroid website:
Download instructions for Undroid Plugin can be found here: http://undroid.nolimit.cz/download
Other screenshots for Undroid Plugin can be found here: http://undroid.nolimit.cz/screenshots
There is also few comments about the Undroid plugin which can be found here: http://undroid.nolimit.cz/discussion.