Ah, that was fast!  Here's what we posted as the answer to your question that we did from your email request:
That's terrific that you've got your first document working.
You 
can send an email (and do other actions) by configuring "custom logic" 
on the package where your Terms of Service has been defined:
http://code.google.com/p/openesignforms/wiki/ProgrammingGuide#Customize_logicAnd a bit later talks about sending an email:
http://code.google.com/p/openesignforms/wiki/ProgrammingGuide#Send_email_actionIn
 your case, assuming that once the customer signs the terms it's done, 
you can just create a custom logic rule for the even "Transaction 
completed" (and leave the limit to documents or parties unselected), and
 then 'Add action' to create the email to send.  If there is more than 
one party involved, you can instead use "Party completed" and select the
 signing party so the email is sent only when that party is done.
Note
 that you can attach the signed document to the email, either in its 
native HTML or as a PDF file just be checking the option when 
configuring the send email action.