Here is an HP article explaining how to utilize the default drivers included with Mac OS X Snow Leopard with your HP Multifunction device:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01846935&lc=en&dlc=en&cc=us&product=3198092&os=219&lang=en
Here is the list of 10.6 compatible printers and drivers included in Snow Leopard:
http://support.apple.com/kb/ht3669
If your printer is not listed here, check the manufacturers website for drivers compatible with your version of Mac OS X.