I've noticed a little oddity with the iPrint client (Nw 6.5sp5) on 10.4.7.
Secure printer.

If I go to print and the printer is in sleep mode (HP 9040), the printer
wakes up, the document prints, the "completed" tab in the printer window
shows that the job finished, but the "Active" tab still shows the job as
starting. Only option too clear the active window is to delete the job.

If, on the other hand, the printer is not sleeping, the job prints and is
removed from the active tab.