Some resources I’ve found helpful in learning to create the art of haiku.

Because I always start my research with wikipedia: http://en.wikipedia.org/wiki/Haiku and http://www.wikihow.com/Write-a-Haiku-Poem

http://www.ahapoetry.com/haiku.htm

http://www.toyomasu.com/haiku/

I like this simple explanation of both traditional haiku and how it has evolved: http://www.poets.org/viewmedia.php/prmMID/5782

http://www.modernhaiku.org/