Many people seem to have been having the same problem with their Macbooks of one day being able to login fine to their wireless network, and then the next they can but DHCP will not give them an IP address instead they get an auto-assigned IP in Airport. No amount of rebooting, removing settings, switching off of firewalls, or entering of manual IP settings etc will fix it.
Apple Airport auto assigned ip Solution:
Use the Assist me button found at the bottom of the Network.prefpane Select the default options and enter in the network you use and the network key/password. Allow it to connect and presto solved !
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