If you want to automate your build process then you are in the right spot. Continuous Integration is a process of automating the build process from various source control system. We have lot of free Continuous Integration servers in the market today. Here are few,
My favorite is CI Factory. These CI servers can talk with variety of source control system like Visual Source Safe, Subversion, CVS, Vault and VSTS Version Control.
They also support various plugins like NCover(Collects code coverage information), nDepend(Calculates code quality metrics), Simian (Detects copy and paste duplication), NUnit ( Unit testing).