ed wrote:
> Just to say thank you to everyone who sent me ideas and great examples, 
> it looks as if one or more of these will fit the bill and occupy my weekend.
> 
> Ed
> 
I second that.  I was looking for graphing software too and it has saved 
me a lot of hunting around the web.  I plan to generate diagrams of a 
flow chart/FSM generated by a Ruby app.  Essentially a basic workflow 
management system.
It looks like there is a Ruby API but it was last updated in 2001...
http://rockit.sourceforge.net/subprojects/graphr/
Simon