A poll can be created in each of the subforums, hence, per category. The option to start a poll is incorporated in this forum's software. An example can be found here.
When you start a new thread, you will see an option "Post a poll". Just check the box and fill in the necessary blanks. You can add a maximum of 20 options for people to vote on. You can allow multiple choices, or just 1. Results will be shown in graphic bars (horizontal), displaying the number of votes per option. If you make it a public poll, it can even show what people voted what option (should not only be available for mods/admins).
I agree with Domin8tor, we have this option available in this forum's software, so I don't see a need to start a new 'zone' for this.