Here is a collection of the blog sites I often visit

wlanpros.com,    Keith R Parsons
divdyn.com,    Devin Akin
sniffwifi.com,  Ben Miller
wifinigel.blogspot.com     Nigel Bowden
cwnp.com,   CWNP-programme
cleartosend.net,    Rowell and Francois podcast
mrncciew.com,  Rasika Nayanajith
wifininjas.net, WiFi Ninjas
semfionetworks.com, Francois Verges

Glenn Cate has the best and most comprehensive Wi-Fi blogroll on the web, gcatewifi.wordpress.com