I really struggled creating my Google Site; especially the calendar and editing a pre-made template. I eventually had to abandon the pre-made template because I could not figure out how to change the picture of the "teacher" nor how to remove "Mrs. Smith's classroom" from the sidebar. I don't think my site looks too good, the template would have been much better, but I wanted to concentrate on the requirements before I got it to look "pretty."
I like color so I was disappointed that the calendar feature didn't bring over the colors to the site. Other than that, once I got the calendar embedded, it was easy to add items. I was a little surprised that after editing the page that you basically only see a square that says calendar until you save and go back to the page.
The form was easy to create using 5 questions, but when I saved it to the site and then tried to edit to add another question I couldn't get past the spreadsheet layout to do so. If I was more comfortable with it, I could see it being useful to store contact info. I didn't make a "quiz" to see how that would work but I will if I have more time this week. The calendar would help me be more efficient so I knew exactly who was going to be in the office and when to schedule training.
I did not know that Google had a Sites feature but I had used the calendar before just as a stand-alone calendar. I also didn't know that there was instant messaging via Talk which would be a good program to use and easy to do so.