Which technology stack to use for rapid web development?
We are looking to build web application that will relies on some web services to send some command and retrieve some data.

We basically looking for a suggestion of what should be the easiest technology stack that we can leverage quickly to build a proof of concept?

We both very strong .NET engineers which strong background on Javascript, ASP.NET, Ajax.net,SQL Server, basically, very microsoft guys. 
However, for this project, which is designed to be an enterprise product, we would like to see if we are missing out on something and maybe write it in PHP, Ruby, Python or any other suggestion. We are very open to hear what other people suggest.

Thx
Which technology stack to use for rapid web development?
===

We are looking to build web application that will relies on some web services to send some command and retrieve some data.

We basically looking for a suggestion of what should be the easiest technology stack that we can leverage quickly to build a proof of concept?

We both very strong .NET engineers which strong background on Javascript, ASP.NET, Ajax.net,SQL Server, basically, very microsoft guys. 
However, for this project, which is designed to be an enterprise product, we would like to see if we are missing out on something and maybe write it in PHP, Ruby, Python or any other suggestion. We are very open to hear what other people suggest.

Thx