Classic Web 2.0 tool. Type out a few lines. Get stuck for a rhyme? Option click on the word and it will list a slew of rhymes for it, sorted by number of syllables. Now I can finally find words that rhyme with Orange!
"Look up rhyming words as you write. Instead of leaving what you're writing to find rhymes in a rhyming dictionary, just alt-click (or option-click) on the word you need a rhyme for and select from a pop-up list of suggested rhymes."
Via Steve dembo, Jennifer Dorman