The SDC build tasks is now available in CodePlex http://www.codeplex.com/sdctasks 

Project Description from the Site :

This is the latest version of the SDC Tasks for .NET 2.0. The SDC Tasks are a collection of MSBuild tasks designed to make your life easier. You can use these tasks in your own MSBuild projects. You can use them stand alone and, if all else fails, you can use them as sample code.
There are over 300 tasks included in this library including tasks for: creating websites, creating application pools, creating ActiveDirectory users, running FxCop, configuring virtual servers, creating zip files, configuring COM+, creating folder shares, installing into the GAC, configuring SQL Server, configuring BizTalk 2004 and BizTalk 2006 etc

Use these taks and save your time in writing these tasks !