Ok... so I finally got a wireless router. Config was reasonably smooth. My iMac is now working wireless (instead of ethernet over power lines)... and I'm typing on the internet right now! My wired computers in the room with the router are also happily still on the internet as before. BUT... now I can't see my computer on the wired connection with my wireless iMac. I am sharing folders on my Windows XP computer, did create a guest account, and was able to share files as configured with my wired-only router. IF I put that back into the mix and go ethernet to my iMac, all play well. Basically, what it appears like is that my wireless router is segmenting my local network... and even though I am on one continuous subnet with consecutive DHCP addresses... I cannot even ping from my wireless to my wired or vice-versa. Either computer can, however, connect to the router via web-interface for config. I'm basically stumped as to why computer-to-computer communications on the local network are being prevented by the router... and it appears as though the router is the culprit since my old router will allow it. Any ideas?