I'm also having this problem
usually I fix it manually with sudo killall -HUP NetworkManager
I have an Acer 5610 laptop (ipw3945)
05:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network 
Connection (rev 02)
06:01.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
This didn't happen in Feisty.

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Regression from Feisty to Gutsy: No network devices after Resume from 
Suspend-to-RAM
https://bugs.launchpad.net/bugs/155432
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