Clipping, it's all about the clipping.
Here's a pictorial (scroll down) - to explain it.
http://www.quilterscache.com/StartQu...ltingfour.html
Here are a few pages from Elly S. book, also with some good diagrams:
http://books.google.com/books?id=-G-...corner&f=false
If you prefer a video, go to
http://www.youtube.com/ and do a search on "needle turn applique" - there are plenty of videos out there.
And your tag line - :mrgreen: :mrgreen: :mrgreen: