[X4U] Printer advise wanted

[Robert A. (Bob) Hall]

I have two questions.
1. Does anyone know of a OS X printer driver available for the HP 
DeskWriter 520? HP says they will not be providing one.

2. How can I drive my HP DeskJet 930c from two computers, a G3 and a 
G4, without having to leave one on to allow printer sharing. Is there 
some form of arrangement using a USB hub to allow this.
Or
  Is there is there a wireless or Ethernet or AppleTalk device  that 
would allow the printer to be shared on the network (again without 
having a computer tied up to for "printer sharing")? Similar to the
AppleTalk printer adapter (Phonenet) that is or was available for OS 
9 and earlier.

Thanks in advance for your help.