OK, so I checked my security log and despite not boradcasting SSID and using MAC address filtering I've got this in the log which a quick Google suggests isn't too good.
Sat Aug 23 17:02:47 2008 : DHCP Client : Receive Ack from 68.87.73.12, Lease time = 345600
Sat Aug 23 17:02:47 2008 : DHCP Client : Send Request, Request IP = 71.197.4.219
Thu Aug 21 17:01:40 2008 : DHCP Client : Receive Ack from 68.87.73.12, Lease time = 345600
Thu Aug 21 17:01:40 2008 : DHCP Client : Send Request, Request IP = 71.197.4.219
Wed Aug 20 10:54:17 2008 : **TCP SYN Flooding** Source IP:192.168.2.68 Port:60131 Dest IP:83.195.16.79 Port:6881
Wed Aug 20 10:54:17 2008 : **TCP SYN Flooding** Source IP:192.168.2.68 Port:60130 Dest IP:83.81.75.155 Port:6881
Wed Aug 20 10:54:17 2008 : **TCP SYN Flooding** Source IP:192.168.2.68 Port:60129 Dest IP:97.117.11.62 Port:43360
Wed Aug 20 10:54:17 2008 : **TCP SYN Flooding** Source IP:192.168.2.68 Port:60128 Dest IP:24.163.201.73 Port:25770
Tue Aug 19 17:00:33 2008 : DHCP Client : Receive Ack from 68.87.73.12, Lease time = 345600
Tue Aug 19 17:00:33 2008 : DHCP Client : Send Request, Request IP = 71.197.4.219
So I had a look round and it seems My WiFi Zone 4 is free for download now! Just tried downloaded it and blocked my wife who got a bit worried for a second