Dogwood Aikikai offers classes in Iaido.  Mitsunari Kanai Sensei was our chief instructor until his untimely death in 2004.  Claude Berthiaume Sensei, senior Iaido student of Kanai Sensei, is currently our chief Iaido isntructor.  The techniques are taught from the following Ryu :

1) Muso Shinden Ryu

2) Toyama Ryu

3) Eishin Ryu

4) Keisa Ryu

5) Hosoda Ryu

6) Shindo Munen Ryu

7) Zen Nihon Kendo Renmei Seitei Gata

Japanese Swordsmanship: Technique and Practice (Gordon Warner and Donn F. Draeger) has a very nice overview and introduction to critical elements of Iaido including the history of sword arts.