I like this one too, it emphasizes the scalability of cloud computing a bit more. A bit like "Sendung mit der Maus" style, but an excellent presentation! (check the feedback on youtube) I hope you enjoy it, it's only about 5 minutes long...
Ok, maybe a bit too simple for a geek like you... Anyway, just watch it in your coffee break, and you'll have a basic understanding of what it's all about.