This kernel is definitely an improvement.

In the case below the machine survived three "Firmware error detected"
messages without having to allocate memory:

-> machine reboot
Sep  8 22:13:08 centrino kernel: [   27.629943] ipw_alloc_fwbuf(6464)
Sep  8 22:13:08 centrino kernel: [   27.657615] ipw_free_fwbuf(6464)
Sep  8 22:13:08 centrino kernel: [   27.657620] ipw_alloc_fwbuf(168336)
...
Sep  9 15:00:53 centrino kernel: [60498.519701] ipw2200: Firmware error 
detected.  Restarting.
Sep  9 21:44:53 centrino kernel: [84738.557118] ipw2200: Firmware error 
detected.  Restarting.
Sep 11 17:00:55 centrino kernel: [240501.108055] ipw2200: Firmware error 
detected.  Restarting.
...

The firmware is simply reloaded and the connection is reestablished.

So I would assume the problem never was ipw2200.

Could it be that some other kernel module eats up the precious kind of
memory that ipw2200 previously needed to reload its firmware?

I have something in mind like Bug #328232 where the values in
/proc/dri/0/gem_objects keep constantly growing. It would make sense
that machines having an ipw2200 WLAN adapter also use an Intel graphics
chipset.

At least my setup and that of the original poster match this
configuration.

-- 
ipw2200 page allocation fault - no wlan until reboot
https://bugs.launchpad.net/bugs/363150
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