Why are my Nook and Ipod Touch suddenly not connecting to my wireless 2Wire router?

My Nook and Ipod Touch stopped connecting to the internet a couple of nights ago. Both devices have been connecting fine. Now I get a message from Safari that I am not connected to the internet. However, I am receiving a full signal from the wireless router. Further, the nook tells me that it is not receiving an IP address. I've tried a second router with nearly the same results with the exception that my wireless laptop will now connect and browse but still no luck with the Nook and Ipod Touch. I've been to the second level tech support with AT&T and they suggest trying still another new dsl adapter. Any ideas?