I have same problem:

[EMAIL PROTECTED]:~$ sudo iwconfig wlan0 mode ad-hoc 
Error for wireless request "Set Mode" (8B06) :
    SET failed on device wlan0 ; Device or resource busy.

[EMAIL PROTECTED]:~$ uname -a
Linux jeffersonlaptop 2.6.24-17-rt #1 SMP PREEMPT RT Thu May 1 16:23:33 UTC 
2008 i686 GNU/Linux

[EMAIL PROTECTED]:~$ dmesg | grep iwl
[   48.377513] iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection 
driver for Linux, 1.2.0
[   48.377523] iwl3945: Copyright(c) 2003-2007 Intel Corporation
[   48.590601] iwl3945: Detected Intel PRO/Wireless 3945ABG Network Connection
[   51.916901] iwl3945: Tunable channels: 13 802.11bg, 23 802.11a channels
[   51.919390] wmaster0: Selected rate control algorithm 'iwl-3945-rs'

-- 
iwl3945 doesn't support ad-hoc networks
https://bugs.launchpad.net/bugs/201597
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