There are a lot of resources online that can be useful in engaging students and helping them learn 21st century skills. Most of the new web 2.0 tools are free, but they require you to register. Registration often requires a real email address. This can be a problem if your students don't have an email address. But where there is a will, there is a way. Your students can register for web 2.0 websites without having their own email address. All you need is on email address under your name. Then go to Not Sharing My Info and get as many anonymous permanent email address' as you need. Give one of the email addresses to each one of your students. Any emails sent to the anonymous email address will automatically be forwarded to you.
Have you tried Not Sharing My Info? If you have let me know your experience using the service.