There’s been quite a bit written about Microsoft’s plans to offer its core Office applications as ‘Web Apps’
A new blog has just been started this month, giving some useful information on how the Web Apps are being developed and what the guiding principles are for their design.
The three building blocks are :
Read more here : http://blogs.msdn.com/officewebapps/archive/2009/07/17/9837716.aspx