Haiku of Kobayashi Issa http://xavier.xula.edu/~dlanoue/issa/index.html
This website offers a very large (1,780+) collection of the Buddhist priest Issa's haiku, searchable by keyword and by year of composition. Very good translations by the noted scholar, David Lanoue. Excellent biographical information about Issa (1763-1827).
Hokku-Inn http://groups.yahoo.com/group/HOKKU-INN
A haiku poetry e-mail list, coordinated by David Coomler, rooted in Zen/Ch'an traditions and the work of R. H. Blyth. Extensive archive of informative articles.
Basho