SMF supports most popular poll-related features:

• Unlimited poll options
• How many options a user can vote for (per-poll setting)
• Allow users to change their votes (per-poll setting)
• Allow users to see the results before voting (per-poll setting)
• How long the poll should run (poll expiration) and option to hide results until poll expires
• Show which option(s) you voted for (your choices are shown in bold)
• Lock voting (close poll)
• Reset vote counts

Poll permissions:

• Add poll to any topic
• Add poll to own topic
• Edit any poll
• Edit own poll
• Lock any poll
• Lock own poll
• Post polls
• Remove any poll
• Remove own poll
• View polls
• Vote in polls

In addition, there are mods (plugins) available that will allow you to see who voted for which option:

• http://custom.simplemachines.org/mods/index.php?mod=3373
• http://custom.simplemachines.org/mods/index.php?mod=3003
• http://custom.simplemachines.org/mods/index.php?mod=347

Recent versions of SMF support guest voting and several mods support the ability to create multiple polls per topic.

Poll topics in the SMF docs:

• Starting a new poll - http://wiki.simplemachines.org/smf/Posting#Starting_a_new_poll
• Poll options - http://wiki.simplemachines.org/smf/Posting#Poll_Options