Observed 344 wireless access points.
I didnt save the data but from just scrolling through it i noticed a few things.
Almost all of them run channel 11 or channel 1 - this is interesting, overall if you if you want the least interference, it seems it'd be a good idea to use channels 3-9!
Of course, check with inSSIDer (or similar) for your area, but i just found this interesting.
Also the majority of them seem to be Thompson branded - ie Telecom customers. The next most popular was DLink, followed by linksys/netgear. Dynalink and Belkin popped up every now and then too.
Most used WPA2-PSK due to telecom sending them pre passworded. Interestingly, there seemed to be a fair few more on WPA-PSK than WEP with perhaps a few more on WPA.
Seems people are listening to the advice of 'WEP is bad'.
Very few were unprotected.
Hardly a scientific study, but i just found this interesting.