Processby

Storky87

This plugin adds a question and answer page in WordPress. 
They can be displayed either list or divided into categories. 
Display all the questions on the page, or each question will have its own page with the answer.

WP Question & Answer

Adds a question and answer page in WordPress.

binnyva

Pollin wordpress plugin will let you create and add polls to your blog. It can be shown to your visitors who will be able to vote in the poll.
You can add the poll in a post by including the html comment [POLLIN 1] in the post. Here 1 is the ID of the poll to be shown.
More Details at <a href="http://www.bin-co.com/blog/2008/11/pollin-wordpress-plugin/" rel="nofollow ugc">Pollin WordPress Plugin post</a> in my blog

Pollin

Pollin wordpress plugin will let you create and add polls to your blog. It can be shown to your visitors who will be able to vote in the poll.

WP Question & Answer vs Pollin