To create a poll, just create a thread as usual, but at the end of it, precede each of your response options with the new "r" tag I made up: <r>
Each of your response options will get a radio button next to it, unless there is only one response option, which will get a text box where people can input a number. (It doesn't make sense to have a poll with just one response option, so it's convenient to use that case for a poll where people guess a number.)
Responses are visible as soon as you vote.
You have to be logged in to vote so I can remember that you voted.
Features to add:
* histograms of results rather than just counts
* poll-closing times so no one can see the results until then
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