http://www.wi-fizone.org currently lists only 3 entries for Wi-Fi zones in Chennai.
Fisherman's Cove - SSID - Microsense
Taj Connemara - SSID - Microsense
Taj Coromandel - SSID - Microsense
I know that Le Meridien, Chola Sheraton (and other 5 star hotels ?), Chennai Central Railway station have it. Wonderning why those aren't figuring here. Maybe the providers need to put them on WiFi-Zone.org ?