Non-XML binary formats.

I'd be interested if anyone is working on, or knows of binary formats 
with similar characteristics of binary XML but is not based on XML?  I 
have developed one such alternative called Argot (some details at 
www.einet.com.au ).  I'm interested if anyone has seen or developing 
other formats (commercial or free) ?  I appologise if this is not the 
best place for such a question, but I figure this working group would 
have the most wide knowledge in this area.

Also, a friend pointed me towards the XML for Binary Interchange 2004 
web site.  Ashame I wasn't aware of it before it happenned.  Is there 
plans for a similar event in 2005?

Thanks,
David Ryan.
www.einet.com.au