Blogging

7 Tips for Students Who Blog - Great starting point for your classes.

Gmail

About Gmail- from the Google Help Desk+
How to Link Multiple Gmail Addresses- Do you want to link more than one of your Gmail addresses to a single inbox? Here are the instructions. By InternetDuctTape.com.
90 Tools to Make You a Gmail Pro

Google Docs

Ideas for Teachers using Google Docs
Getting Started with Google Docs
Google Docs Blog - Keep up-to-date with improvements and other news related to Google Docs.
Google Apps Tutorial - includes all Google Applications.

Digital Music and Sounds

55 Great Websites To Download Free Sound Effects

Twitter