In 2009 - 2010 I had to pick up another teacher's classes and teach BCIS (Business Computer Information Systems). I had Ubuntu on the computers in my lab, so rather than doing Windoze I chose to use Zoho online apps. They are mostly the same as Google apps, but maybe better.
I really like the Zoho apps. Also it was so handy that when a student created a slide show for another class, he/she just had to publish it and send the link to the instructor.
Google apps offer mostly the same flexibility.