I was very interested to read Maud Newton's take on cursive in the NPR piece she did on Kitty Burns Florey's Script & Scribble: The Rise and Fall of Handwriting.
I went looking for one of the teaching methods advocated by Florey and hit on Barchowsky Fluent Handwriting. You can order materials on the site - including guides for teaching young children (check) and guides for correcting bad habits in adults (check). You can also watch videos in which Ms. Barchowsky herself explains the methods.
On the Barchowsky site there is also a link to Gunnlaugur SE Briem's site which also contains very useful advice about teaching the italic method, and which contains this beautiful sample of the author's own handwriting: