One of the advantages of Twitter is that it's fast - users type fast messages, telling everyone what they think in a matter of seconds. So, it would seem that polling Twitter users would be a natural fit. With PollDaddy for Twitter, you can create Twitter polls by simply entering your username and password, creating your poll and entering possible answers. The poll question is then posted on your accouont with a link to the answer page. So, the user clicks once to get to the answers, then clicks again to choose their answer.
All in all, it's not a bad way to get a quick, down-and-dirty response to a question. Ask for product feedback, ideas for what your consumers want from your company, ask for new content ideas ... just about anything. With these polls, no login is necessary and you can embed the poll elsewhere, so you can also extend the reach of the poll beyond Twitter. There's a similar service in in twtpoll.com.