Hi Bryan - sorry did not checked, but I did a lot of automatic recommended updates when I switched on the computer first time. I just bought it last week from Fnac and it seems it needed all sort of updates, including a Firmware one and yes, the 10.4.8, which is the one I am using now.
Before it did the automatic updates we were toying with it for a good 6 hours and the Airport was reliable and full power from the very beginning. Now it is always 3 bars. The connection drops quite often to be funny - specially since I use the Internet for my work a good 12 hours per day.
Installing again the Intel Combo 10.4.8 update seems to have improved it. Getting rid of DHCP and using manual settings too. Also, hidding the wireless network broadcast. None of the other features seems to have helped. Now its running stable since yesterday morning when I installed the Intel Combo.
Oh, also... the powerbook network speed is measured to 2.200 and the iMac goes to a mere 600. I have 3 megabytes ADSL connection.
Hope that helps!