In honor of April, which among other things is National Poetry Month, here are:
Ten Things About Poetry
Bartleby.com has one of the largest collections of poetry on the internet, all searchable and all 100% free.
You can generally make some interesting accidental poetry by inputting text into the Bonsai Story Generator or Robopoem, or playing with the Automatic Poetry Generator, the Genuine Haiku Generator, Icon Poet, or The Poetry Generator.
For those of you who have poetry you'd like to sell, Duotrope.com has a search engine for poetry and fiction markets.
From WikiHow, How to Write a Poem.
Got fridge? You can have a poem on it in no time with one of the great word-magnetic sets from Magnetic Poetry (also makes a great gift for poets of any age, especially youngsters.)
Scholastic has an online Poetry Idea Engine that teaches kids about four different forms of poetry (haiku, limerick cinquain, free verse) while they have fun playing.
National Poetry month info abounds over at Poets.org*.
My favorite poem: somewhere i have never travelled by e.e. cummings
Ten Things for Poets.
Use poetry to make word clouds (and often get some compelling story title ideas) via my Wordling Poetry method.
(*link nicked from Kris Reisz)