machoo.....
um a bit nu to dz site...
nt quite sure whether it is allowed to post about hacking n' stuff...
neways there are 3rd party softwares which v can use for dz lyk sm sniffing apps which usually used to hack LANs.
the problem wit WLAN is itz usually bn hidden or sm users hav put a WEP key for their security purposes but if u r lucky enough u mite find non-secure WLANs..
gud luck..
keep searchin...