use a wireless print server, but these only work only with some models to print. No idea about wireless scanning, though.
However, the new HP 2710 has a wireless feature which can allow you to print and scan wirelessly.
Recently a friend bought the above and i helped him set it. It was breeze to set up and the print quality was superb. also I tested the scanning by putting a photo on the scanner and pressed the scan button on the scanner. The scanner software activated on the laptop that was in the other room. PC World sells thses for £299