@Ecaz: I'm a bit confused... You couldn't acess SSH over WiFi with dropbear, but it works with OpenSSH?
That... makes no sense, the code path for the iptables switch is completely distinct from the dropbear/openssh stuff. :? (And, AFAIK, both should default to listen to every if).
Could you elaborate a bit? :}
Also, what twobob said (it's even in the doc). There's also a one-liner to catch the password once you're in (which is easy with the default config, because dropbear doesn't check password over USB, and telnet doesn't check anything at all).