Why I'm pretty sure my little fly around the world stunt will get me banned is shown in the GetSatifaction forums here, where people are upset about folk who check-in where they are not (some even dislike "drive-by check-ins) : Very VERY questionable check-ins and further down in the thread you'll find this conversation suggesting that I am using proxies.
Proxies are not involved in this little hack, not at all. M-gowalla is. If anyone at Gowalla wants the step by step instructions (though I'm sure you already know since you seem well aware of the m-gowalla hole), just contact me via this form. I have tried to contact you several times already.