The http://www.polleverywhere.com/features website contains video clips of the various features that you can use with polling. I found the PowerPoint slide information interesting.
New York Times technology blogs are located here. The articles are very current. I (as a teacher) will probably benefit from these sites as much as my students. I plan on posting the YouTube "Blogs in Education" video along with these blogs, because the video gives a good description, application and history of blogs.
Twitter is a useful tool for seeing what's happening at this very moment, but many of its cooler settings and tweaks are hidden or under-utilized.
Here are our favorite things you didn't know you could do on Twitter. #TT1131