Here is what I have found:
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This is a question that comes up quite often when looking at Google Apps for Education:
How do I block students from adding gadgets in Sites in Google Apps?
The FAQ and Google Code Resources that answer this question makes it seem pretty simple, and it is, once you know the step by step instructions.
First of all there are 2 main options of blocking gadgets in sites or on iGoogle pages:
This is a question that came up in the Illinois Google EDU user's group this morning.
Just as we are not required to hold on to every assignment, notes between students, or notes from students to teachers we are not required to hold on to every email a student has ever composed or sent from our email systems.