Suddenly unable to connect to wireless network:

I've got an odd problem with my two-week old MacBook Pro and its connection to my wireless network. I've done what I think is pretty exhaustive troubleshooting, but remain baffled. Here's the story.

This morning I connected to my wireless network (DSL 2WIRE modem/router) with no problem. This afternoon I returned and Airport refused to connect, giving me the error message, "Airport is unable to connect to the wireless network*" The network shows up as being available, but when I attempt to connect, it wont. (I didn't make any changes or install any programs this morning).

Here's what I've done:
[1] Restarted the router
[2] Repaired permissions
[3] Deleted the network's entry in Keychain Access
[4] Re-entered my WEP code (assuring it is in correctly; I've tried both with the "$" and without)
[5] Used interface robustness and without.
[6] Attempted to join the network from the System Preferences>Network.Airport route.
[7] Created a new account and tried connecting.

Other tidbits of information:
[1] Another MacBook in the house connects to the network with no problem.
[2] My MacBook can connect to another (unsecured) network that I can "see" in my house.

So, it would seem my Airport card is working okay.
Any ideas??
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