If anybody's interested, I could prepare a few slides on the
technology behind
machsend.com.
It's detailed here:
http://leadthinking.com/213-p2p-using-tcp-ruby
I could explain how to do P2P file transfers using TCP and Ruby,
tunneling through the firewall.
Alternatively, I could give a brief intro into using Ruby with Yahoo
BrowserPlus.
Let me know if there's any interest in those topics, although it'll be
a very concise talk.