Can no longer print wirelessly - False Message - "Network Host is Busy"

Fairly new to Macbook, but when I initially set up my printer wirelessly it worked fine. After recent 'updates' to the OS and HP drivers, I'm stuck with the 'network host is busy' problem that I seen in many other threads. There have been NO changes to my hardware - same router, same printer. Print jobs sit in queue and host is always 'busy' but it's not, really. There doesn't seem to be a good and actual "solution" for the issue yet. Here's the details:
Macbook Pro, 13"
Mac OS X 10.6.4
HP OfficeJet J6400 (drivers - 3.0.4 - just updated with the latest update from Apple)
Printer is running ONLY wirelessly, it is not hooked to a PC. It has an IP assigned by my router.
I have two PC's that print to it just fine, wirelessly.
I removed the printer from the Macbook, and re-installed it sort of manually using IPP as the protocol. The Macbook 'sees' the printer, and I can access the printer utilities to view ink levels, see the hardware/firmware information, etc.
I can also print a test page wirelessly from the Macbook, because as I'm told, printing a test page bypasses the drivers; and if you can print a test page but can't print normally, it would seem there's a driver issue, no?
One thing I don't know how to figure out is the 'queue name' so I leave it blank for 'default'. This is the only wireless printer and there are no other shared printers.
So I'm pretty well stuck, and have to move files or send links to my PC so I can print stuff (flawlessly) from there since the Macbook won't print at all - I always receive the 'network host is busy' message. The frustrating thing is, when I first installed it months ago, installation went very smoothly, and everything worked perfectly - until recently.
I know it's not just me, but any help is appreciated. Thanks!
Macbook Pro 13" Mac OS X (10.6.4) HP OfficeJet J6480 with latest drivers from Apple

Checking the HP web site I could not find a manual for the J6400 but there was a J6410 and its User Guide states the following...
1. Click the HP Device Manager icon on the Dock or in the Hewlett Packard folder in the Applications folder.
2. From the Information and Settings list, select Network Printer Setup Utility.
I also found the following HP wireless support site that suggests the print queue creation is performed by the HP software. No mention of how to configure the Mac queue manually.
http://h20563.www2.hp.com/p/_wireless/reconfiguring-system-help.html

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