Apple has seeded another version of Mac OS X 10.4.9 to developers today. The releases appear to be accelerating, typically indicating the product may be near release.
Apple seeded the 8P2117 build during Macworld Expo just last week, and has now released 8P2120 to developers today.
The new seed has a 40+ laundry list of fixes and under "Known Issues" it lists "None".
The last update (10.4.8) to Mac OS X 10.4 (Tiger) was released on September 29th, 2006.