Here are some helpful websites regarding Haiku:
The folks at Haiku are making numerous video tutorials explaining how to use Haiku. Highly recommended viewing!
Haiku Helpdesk and Online Knowledgebase
Here you can search for an answer in an expanding database of questions, populated from actual questions users have asked. You can ask your own question or submit a help request (free & simple registration required).
Haiku Suggestions & Feature Requests
Submit suggestions and request features that you'd like to see added to Haiku. You can also vote on what others have previously suggested. The suggestions with the highest votes get higher priority in Haiku's development plan. Make sure you create an account before you make your suggestions! Input (including votes) by anonymous visitors doesn't count!
View examples that other educators have submitted of how they are using Haiku.
This is a list of Haiku version releases, with details about what was added or fixed.