iLife '05 requires a computer with a display resolution of at least 1024 x 768 pixels. This means that iLife '05 cannot be installed on the original iBooks. The original iBooks are Blueberry, Tangerine, or Graphite in color. The iBook (FireWire) computers, which are Indigo, Key Lime, and Graphite in color, are also affected.
If you attempt to install iLife '05 on one of these iBooks, you'll see an alert message:
iLife '05 cannot be installed on this computer. This software requires a computer with a higher-resolution screen.
You can find more ways to identify which iBook you have here.