Google Apps Learning Center - Use this site to guide you during your first days and throughout your transition to Google Apps. Search the help center for information. App-specific sections:
Administrative Assistants - Google has created a special guide for you on their website.
Tips & Tricks - beyond the basics.
For Mobile Users
The lynda.com Online Training Library® has several outstanding training courses on using Google products, including Gmail, Google Calendar, and Google Docs.
Google Apps Status - is the service working properly?
Read the Google Student blog
Follow Google on Twitter: @googlestudents
Google for Students on YouTube