hi,
most curve tutorial i run across generally just give you the basic of just click this and that.. and that it... and for beginners and novices I don't think that enough ...
came across this video tutorial which gives a litle more...
besides showing a number of things involving basic techniques
it give you a lot of nice tid bits of info of why ...
http://www.deke.com/content/photoshop-t ... -24-curves
the site does have some other tutorials on various tools which might also
be very usefull
