Lots of Choices

Getting up to date on the tools out there for working over the web can be overwhelming but oh so much fun. Blogging is a create tool to use as an extension to classroom instruction. Homework assignments can be posted and students can ask questions in the comment section. Using a blog in this manner is very effective when the teacher makes sure to keep updating assignments and more importantly responding to student comments and questions.

Mobile blogging can be another tool to use with students as a reporting place for specific assignments. Here's a suggestion: geometry exists everywhere in the world. For the students who have a mobile phone (most do these days), have students create a mobile math blog, capturing geometric shapes and reporting their observations in their moblog. You would need the address for evaluating their work. Discussions and expectations for the moblog would need to be covered in class prior to using this tool. It would definitely need to be G - rated.

Some free or low cost spaces for blogging:
Blogger
Live Journal
Typepad

Wikis are good tools for sharing information and working in a collaborative environment. Create your own at Wikispaces. A wiki is a webpage that many can edit together. Pictures can be added to share with others. Wikis are easy to use.

Start your own place on the web for you and your students.