Existing exchange 2010 installations visio diagrams

I am looking to have some sample visios of your existing environments or some hypothetical environments , my goal is to educate myself on the various topologies and options of exchange server 2010 , like the various positioning of the client access, mailbox, unified messaging ,hub transport and the edge server roles . I know this is a vague question , it is more of a discussion to educate me , all respondents willl be awarded points  
WOMBAT-EXchange-2010--03.vsd