Here's an interesting web site. Go right down
near the bottom of the front page and click on "Essence of Aikido"
and follow links - lots of photos of O'Sensei. Interesting articles
on different aspects of Aikido.
Aiki Batto - A system of sword exercises, both
Aikiken style bokken with partner and iaido style solo training with
iaito or shinken, for learning how to handle the sword in an aiki
way.