Asp.net 3.0 or Asp.net 4.0? new Project
<p>We are starting developing new web-based application in weeks times.  </p>

<p>Which version of asp.net would you guys recommend. ASP.NET 3.0 or ASP.NET 4.0 (visual studio 2008 or Visual studio 2010)?</p>

<p>Previously we have worked on ASP.NET 2.0 using visual studio 2005</p>

<p>Same with sql server should we keep using sql server 2005 or migrate it to sql server 2008</p>
