Various (and almost completely unrelated) questions and opinions

[Torbjorn Tornkvist]

The code looks very nice. 
The only thing I have to say is that in, for example, turtle.erl
you have to do the following:

 Shelly = turtle:new(),
 Shelly! {fd, 20}.      

I would have wrapped the message sending in an exported function:

 Shelly = turtle:new(),
 turtle:fd(Shelly, 20).

That way you have one interface less to worry about.
I like to encapsulate the message sending/receiving
(i.e the protocol) within a single module (asynchronous
messages can be taken care of by function call-backs).

Cheers /Tobbe