Developing on an Android device using Ubuntu 9.04

Google's documentation is sometimes out of date, and on this topic it was clearly erroneous, so for anyone interested, here is how I managed to bridge an HTC Magic and Ubuntu 9.04 Jaunty to allow debugging over USB:

On the phone, in Settings/Applications/Development, check the box "USB debugging".

On the computer, install the Android SDK, change to the "tools" directory, then log as root and create file /etc/udev/rules.d/50-android.rules with this content:
SUBSYSTEM=="usb", SYSFS{idVendor}=="0bb4", MODE="0666"
and file /etc/udev/rules.d/90-android.rules with this content:
SUBSYSTEM=="usb", ATTR{idVendor}=="0bb4", MODE="0666"

Then type this:
sudo chmod a+rx /etc/udev/rules.d/50-android.rules
sudo chmod a+rx /etc/udev/rules.d/90-android.rules
sudo /etc/init.d/udev restart
./adb kill-server

You should get something like this:
./adb devices
List of devices attached
HT963LF01297 device