I'll watch this with interest, as I've just installed the same WD Netcenter, partly for backups which we can all access via the router, and partly so we can share the printer without the desktop being on.
Only I haven't had time to do the printer bit yet ! click here*&p_li=&p_topview=1 gives some guidance. I think it only supports certain printers (mine should be OK) and I saw a list somewhere on the WD site. Have you tried the EasyLink control panel ?
Incidentally, if you share files and folders, have you noticed they've stopped being listed if copying/moving ?
Let me know how you get on !