I'm giving a workshop soon in a community where there is virtually no broadband access to the Internet. I've recently visited several schools in New Zealand and Australia that use the Internet to build digital portfolios for students as well as the famous HighTechHigh.org school in San Diego (where students put their portfolios online).
I have been looking for an example of "how teachers can use the Internet in teaching." Here's an interesting exchange that shows the advantage of posting to an online community.
Here's the same post
You can find this Community HERE
It's called Google Apps for Education
I learned about it when I signed up for a course on MIT's Media Lab