It's fully compatible with OS X
Printing to the WGPS606 Wireless Print Server with Macintosh OS X 10.4.2
Most print servers are independent of the OS on your computer. As long as you have printer drivers for your operating system that's all that matters.
Since your printer is an HP you might want to buy a jetdirect box for it, but HP's jetdirect print servers are expensive.
I just noticed that your printer is an "all in one", keep in mind that if you set it up on a print server, you won't be able to use the scanner wirelessly, you'll still need to use a USB cable. (this is why i don't like all in one printers but that's just my opinion)
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In my apartment, I have 2 printers, (a HP deskjet and a brother laser) connected to my netgear print server, and I have a scanner. I have 2 computers and a laptop. I can use the scanner on all three computers even though it's hooked only to one by using VNC, and I save all my scans on a network shared folder by default.
What you might want to do, is get an old computer (a PII with 128+mb of ram would be fine) and install windows on it, (if you get an old computer it will probably include winxp or win2k) Install your Printer/scanner to it, and connect the computer to your network. You can print to a windows shared printer from your mac (when setting it up select "windows printer via SAMBA") and you can use windows file sharing and VNC to control your scanner. You can probably get a suitable computer for about $100. After you get it set up you won't need a monitor, keyboard or mouse for it.