Sorry I've been quiet...been busy having net problems!
Somebody in the chat shared this great link, which details all the production chains. Tells you exactly how many foresters, etc, you need for an efficient economy.
I thought this may become obsolete with the new updated 'economy tab' (coming next week...I think!), but it's still quite handy to have as a guide, particularly if you're planning your resource consumption wisely ;)
http://settlersonlinewiki.com/index.php?title=Chains
