This plugin allows simple embedding of MEMEdex flash polls into your WordPress posts, or into your sidebar, by using a short tag.
MEMEdex is a polling and survey site. You will probably want to create a free MEMEdex account before using this plugin, so you can create polls which are relevant to your posts.
What I usually do is go to the my page on MEMEdex, create a quick poll, and make a note of the poll id. Then go back to my blog, make a post, and include the memedex tag where I want it.