Inspiring places to read poetry and try some poetry exercises:

Read Write Poem  - Prompts, poet interviews, exercises to try, feature editors

Totally Optional Prompts - This site features weekly prompts in different genres so you can try your hand at different styles & publish it on the site.

Cafe Writing - This site usually posts several prompts for the month (called projects).  Participants can post their works at this site.

Poet Bay - A place for web poets to learn about publishing or improving their works.