that Xniff script looks VERY interesting, i didnt knew it before and i will definitely give it a try (when my work cools down and i have more spare time
), too bad xniff doesn't read the headers properly like you say
i also packetsniffed msn before with wireshark (ethereal) and saw interesting commands too (mainly about the statuses etc, i didnt searched for the transferprotocol then), but i didnt knew much how to integrating it into plus
in my opinion, microsoft wouldn't change the transferprotocol much in the new MSNP16, i guess the new addition is mainly the ability to sign in at 2 places at the same time with having chats replicated at all places, and the filetransfer worked good before so maybe they would let it be the same. But you're right that there isn't much documentation for the new protocol at this time , and that makes it indeed harder to work
i hope you didnt threw away your code on the file transfer script, if you want to reopen the 'project', i'm definitely willing to help (with sniffing, searching solutions or maybe coding...), but first i will play a little with xniff
too bad (in my case) plus' scripting is a VB lookalike language (and i'm only used to c# and java) but i recognize much in the examples and maybe it's time to learn a new language
/ 
