There're several places for people to discuss technologies and content learning on Classroom 2.0, but I couldn't find much mention of Google. A colleague got me hooked of Google just this past spring, and I am amazed at how much it changes. Everyday there's a new tool or new button that just pops up.
I teach high school & community college, and we use Google to share calendars, share documents (for submitting to sharing group papers), chat between students and teachers, groups for discussions on any subject, etc...
My college composition courses are COMPLETELY through Google now :)
So how do you use Google for your classes?