I've been using the Shredder opening guide while I play - I find it quite useful:
I wouldn't have a problem having anyone else use it against me and its within the rules of the site.
I also have been using this Opening guide while I play:
It is a data base too but also offer the pros and cons of each position. I was wondering if it is bad form to be using it as I play.
Is it too much like an engine?