I have an extra ethernet switch I could use, but it sounds like you would not recommend this.  Besides, I'm not sure how I'd plug both the RG and Linksys into the switch, as there is only 1 input port and 4 LAN ports.  But like you said, the 2 routers have different IP addresses (192.168.1.254 and 192.168.2.1).  Even though they wouldn't be able to communicate together, is there a way that I could switch from one to the other (without having to get behind the computer and unplug one ethernet cable and plug in the other)?--somehow internally change which router the desktop is being connected to--so that I can use the wireless printer when needed?

Thanks