In v1 there is a "send_simple" call:
https://mtgox.com/api/1/generic/bitcoin/send_simple

I did not get it working. The API keeps giving me an error on the bitcoin address:
MtGoxError: u'Invalid bitcoin address, please confirm your input' 

Perhaps the parameters have been renamed. I did add the call to the wiki:
https://en.bitcoin.it/wiki/MtGox/API/HTTP/v1#Withdraw_bitcoins


Can someone help us out? Thanks.