How do I know whether my MAC or Airport Express is running at 'n' speed

G'Day
I have my current model MacBook Pro and new Airport Express up and running - no problems love it. It seams like a faster conntection but its always pretty subjective unless you run a test (which I am too lazy to do).
Does any one know how we you can tell whether the conntection is happening at b/g/ or n speeds. My windows machine tells me that is connection at using 802.11 G but I can't seem to find anywhere in the Airport utility or in MAC OS to show what mode it is connected in
Thanks in advance

I'm not to sure I would rely on the data in the logs and stats on the extreme, I have some devices apparently working at -1 mbit/s (yes minus one).
Don't forget, as well as the n enabler which is installed when you install the airport utility, there is an update available which you should install on all your macs connected to the extreme
http://www.apple.com/support/downloads/airportextremeupdate2007001.html

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