An assortment of tips on Ultimate strategy.
Defense - http://www.youtube.com/watch?v=87Tw5EjCmVo explains the stall count, as well as the "force" defense. It explains how to force "forehand" and "backhand" rather than "home" and "away" - but they are one in the same.
Offense - how to get open - http://www.youtube.com/watch?v=phUOsiBZr-o This even includes an easy drill.
http://www.ultimatehandbook.com has a lot of useful information and diagrams.
The basic stack offense - http://www.ultimatehandbook.com/blog/basics/the-stack/ - and it has a lot of useful information and diagrams.
Zone Defense - http://www.ultimatehandbook.com/blog/strategy/zone-defence/
Ultimate Plays and Drills in simple animation -
http://www.menalto.com/ultimate/play_list.php