Tips and tricks section here is good.
actionsportswa.com.au/other vids include kiteboarding 101 kiteboarding 201 etc and The complete kite boarding Guide. (Some parts especially in THe complete kiteboarding guide are quite dated but still good IMO) The fatsands one already mentioned is better than these those i reckon.
There is also some short tutorial clips of the BEST Kiteboarding website amongst others and some short one on good old you tube. Also are online mags with video clips including instructional ones. eg iksurfmag at iksurfmag.com
Hope this helps.