This site has a large number of tutes about all sorts of things. However I did find one I really, really liked but it was a tute on how to use a pattern they were selling. Not all of the tute's are like this, but just giving a little warning.
You will spend ages here so sit and sip a nice cool drink while your browse.
http://www.theribbonretreat.com/cust..._projects.aspx