It would be really cool to add comments capability to the Poll feature.  This could be done by adding a Comments (# of comments) link to the bottom of the poll.  When a user clicks on it, a detail page displays with the poll and shows all comments along with a comment entry form (simillar to how it's implemented in the Blog module).  Of course, the comments would only be visible to people who have already voted (because you wouldn't want other opinions to skew the poll results).