Recent BEAM documentation ?

[Terrance Sullivan]

I recently tripped across the paper "A high performance Erlang  
system" by Eric Johanasson (http://user.it.uu.se/~happi/publications/ 
p32-johansson.pdf) which I gather was published for the PPDP 2000  
conference in Montreal.

Short of wading into recent source code, would people here have any  
recommendations for published documents that would provide more  
recent lower level design & implementation details on BEAM. Or is  
this document basically representative of the present Erlang state-of- 
the-art ?

Thx..
\T