Supported Devices:

PowerBook:
PowerBook G3 (Pismo) Early 2000
PowerBook G4 (Titanium) Early 2001 or later
PowerBook G4 (Aluminium) Early 2003 or later

iBook:
iBook G3 (Clamshell) Late 2000 or later
iBook G3 (Snow) Mid 2001 or later
iBook G4 Late 2003 or later

MacBook Pro:
MacBook Pro (Aluminium) Early 2006 or later

MacBook:
MacBook (Polycarbonate) Mid 2006 or later

PowerMac:
PowerMac G3 (Blue & White) Early 1999 or later
PowerMac G4 (Translucent) Mid 1999 or later
PowerMac G4 (Cube) Mid 2000
PowerMac G4 (Quicksilver) Mid 2001 or later
PowerMac G4 (Mirror Drive Door) Mid 2002 or later
PowerMac G5 Mid 2003 or later

eMac:
eMac Mid 2002 or later

iMac:
iMac G3 Late 1999 or later
iMac G4 Early 2002 or later
iMac G5 Mid 2004 or later
iMac (Intel) Early 2006 or later
iMac (Aluminium) Mid 2007

Mac Mini:
Mac Mini G4 Early 2005 or later
Mac Mini (Intel) Early 2006 or later

Mac Pro:
Mac Pro (Cheese Grater) Mid 2006 or later

Initial Release: 10.4.0 (April 29 2005)
Latest Release: 10.4.11 (November 14 2007)

New Features:
- Reduced Aqua
- Spotlight Search
- Dashboard
- Dictionary
- Support for Intel Processors