I had the exact same problem (Dell E6400, Lucid 64bit) but I had to reinstall 
ubuntu from scratch to solve it...
Wifi was enabled if I booted with the hardware switch in the off state, but it 
didn't work if I booted with the switch in the on stated, and when my laptop 
resumed from stand-by, the wifi could not be enabled.
However, the bug reappeared yesterday and I just did the rmmod dell_laptop, and 
wifi came alive again!!

Thanks!

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Wireless RFKILL defaults to on (wireless off) and can't be turned off.
https://bugs.launchpad.net/bugs/523143
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