Powershell scripts allow you to take advantage of .NET libraries and write scripts which are almost as powerful as the .NET code itself. You can do many powerful operations like call external DLLs, use .NET namespaces like
System.Net, run processes and intercept output, call web services etc. The possibilities are endless. Here, I will show you a Powershell script which assists you in day to day deployment of websites. Everyday, we make changes to web projects, which need to be deployed to development servers, sometimes on beta servers, and finally on the production server. Using this script, you can automate all the manual work that you do again and again on your deployment package every time you upload your website to some server. We use this script in Pageflakes every single day during our local development server upload, beta release, and final production server release. All we do is run the script, go to the server, and extract a zip file on the web folder, and that's all. The new version gets deployed within two minutes without any manual work at all, and completely removes any possibility of human error during deployment.
Deployment made simple using Powershell - CodeProject