Here is my message in bug 6615:

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I read it and compare with my usage and I suspect that WiFi power usage is in driver activity. In my case I see a regular message about losing beacon from some bogus AP - I never use it. And it reports it all day, each second with calm intervals around 10-20secs.

Exactly, the message in /var/log/syslog is:

Dec 26 .... kernel: [....] wlan0: driver reports beacon loss from AP cf1bb52c - sending probe request

(the "cf1bb52c" is reported always, independent from real location and the connected SSID. And it is reported even N900 sitting in 3 foots from WiFi router - it is not my router at home or at work)

Of course, any WiFi transmission sucks the power. I browsed the directories under /var/lib/gconf I don't find any unaccounted connection. I guess it is some rudiments in wl12xx driver from Nokia...

The message is from wlan daemon and it is not seen in dmesg, so to see it you should install syslogd/klogd package.
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Adding to this I can say I suspect some connectivity package which I did install (and may removed since that) which triggers search of cf1bb52c. Something like OpenSSH.