WP-Polls is extremely customizable via templates and css styles and there are tons of options for you to choose to ensure that WP-Polls runs the way you wanted. It now supports multiple selection of answers.

All the information (general, changelog, installation, upgrade, usage) you need about this plugin can be found here: WP-Polls Readme. It is the exact same readme.html is included in the zip package.

Members Only is a WordPress plugin that allows you to make your blog only viewable to visitors that are logged in. If a visitor is not logged in, they will be redirected either to the WordPress login page or a page of your choice. Once logged in they can be redirected back to the page that they originally requested. You can also protect your feeds whilst allowing registered user access to them by using Feed Keys.