Airport connects but not receiving an IP

Hi guys,
Recently I haven't been able to use the internet using airport (wireless), it seems to connect fine, i.e., the airport bars turn black. However I don't get an IP, not even a local one.
I know there's nothing wrong with the router because other macs connect to it just fine.
Anyone have any ideas on what's wrong?

Just curious, is everyone here running Leopard. I never had these problems until Leopard. Now, I've got the same problem using my home network (FIOS) and recently while on vacation. I called AppleCare and they were zero help. They blamed it on the router and said they didn't support the Verizon ActionTec router. Fast forward a few weeks and I'm having the same issue while on vacation. I've seen solutions here mentioning a change in encryption. This network has no password, so that fix doesn't work. I deleted the connection, turned off Airport and then rebooted. I enabled Airport and then it found the connection. Right now, it seems like it's hit or miss with connections. Not very good for me considering I rely on my internet connection for business. Not happy.

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