http://www.poetry.com/Iq/QuizUI.asp
Also, this site has many features which look pretty interesting, it shows the top 100 poems of all time, and has a poetry competition in which you can actually win cash prizes. I would encourage DF poets to participate!
Home page
www.poetry.com
I like the "help with rhyming" bit, I think that's a nifty and handy option to be able to make use of.