Thanks for that, my pitch sense has long dissapointed me, I'll print these out.
For those of you who can't find his posts this url will help:
http://www.guitartricks.com/2000/search.php
input=noticingthemistake&submit=go

I think that singing should be a great way to get your pitch about right; I happen to know for instance that the lowest note I can reliably hit is open "A". This sort of knowledge could save a lot of beginners a lot of broken strings..