I want to develop sharepoint webParts on my development machine. My machine has Windows 7, VS 2005 and VS 2008 installed. What extra I would required to develop sharepoint webparts. I tried to dowload sharepoint development SDK 3.0, but it now worked. I am unable to find Microsoft.SharePoint dll on my machine. We have 3-4 developers working on webparts, so Its not possible to install sharepoint server on developers machine.