When I purchased my Linksys BEFSX41 I had two spare wireless routers a D-Link WBR-1310 and a WBR-2310 respectively. What to do? Turn them into wireless AP's (access points) of course! Increase your wireless coverage, look cool!
First thing's first, set up DHCP on your main router. For me it's the BEFSX41. Set your DHCP range, for example 192.168.0.150-199 giving you some room for wireless devices.