Zoomerang site: http://www.zoomerang.com/index.zgi
Create complex surveys and email or post on website. Basic set is free with more options for payment.
Give it at try. Sample teacher poll
Network54 site: http://www.network54.com
Easy to create simple multiple choice polls with minimal ads. Shows cumulative results of voting.
Try it at http://www.network54.com/Hide/Chat/72770
Their site: http://multicity.com/
Fairly simple to create polls. They generate the html code that you paste into your webpage. It's free temporarily and I'm trying to convenience them to pay more attention to the education market.
Give it a try at http://www.willamette.edu/~jtenny/Communication/Multicity.html There are two samples of polls created by me. Scroll down to find them.