I recently submitted to the Sketchbook May / June 30, 2011 "vegetable(s)" Haiku Thread. It's the first time I've joined in with one of these and also the first time I've taken a good look at Sketchbook: A Journal for Eastern & Western Short Forms.
Pop over and take a look yourself. It's fun checking in every few days to see what new haiku have been added to the thread, and I look forward to seeing what the editor's choices will be in the next issue of Sketchbook. Let me know how you get on!