Just the unit itself and the power adaptor.  Instructions can be found on the Linksys website.

LINKSYS WAP54G - Wireless-G is the emerging 54 Mbps wireless networking standard that's almost five times faster than the widely deployed Wireless-B ( 802.11b ) products found in homes, businesses and public wireless hotspots around the country. The best part is, since they share the same 2.4GHz radio band, Wireless-G devices talk to existing 11 Mbps Wireless-B equipment.