Já postei as minhas. Aqui tem uma coletânea de outras análises. Vou destacar a avaliação do Nicholar Carr: (Nick Carr?!?! w/o bullshitagens?!? unbelievable!?!?!):

"Google's fighting a new war, a war that's barely begun. It's the war for web services. And it knows that, for the foreseeable future, these services will not displace desktop applications but extend them. Google is happy to make Excel more valuable as long as it also encourages greater use of the Internet and, in particular, attracts more traffic to its own sites. In a way, Spreadsheets is not only an Excel complement; it also turns Excel into a complement to Google's own services and the lucrative ads that those services carry."

Cool. Mas será que a MS tá gostando de ver alguém fazer o seu serviço?
Esse discurso: "a MS não perde, só deixa de ganhar", é um perigo!
Acho que a MS sabe disso. Alguém lá deve saber...

---

Update: Impressões da MS:

"The innovations we're delivering in Excel in terms of new usability, new visual user interface advancements, support for collaboration and business intelligence with things like Excel Services are so far beyond [Google Spreadsheets] that it's like watching a time machine from 10 years ago."

Um comentário surrupiado do Digg:

"Paying for microsoft software is so 10 years ago."