Cloud Computing Presentation

Hi all,

I'm currently running a series of small workshops for our ICT Committee (an oversight committee to direct ICT in the school) to try and educate them about new technologies, with an overall aim of helping them make better, more educated decisions.  We've got four of them this year and we've picked a topic for each.  The last was very expertly run by our ICT Integrator, and was on Web 2.0 tools.

The next topic is one I'm planning to take and will be on Cloud Computing (nevermind the crossover between that and Web 2.0).

I was hoping to get some feedback from the brains trust on here about your favourite cloud-based services for use in the classroom and start some general chat on "The Cloud" and the advantages/disadvantages.  Also, any useful resources (like this) you can point me to for my presentation would be great.

Thanks.