See here how I solved the error during Add Solution: failed to extract the cab file in the solution error. This was by incorrect filenames.

This post shows how to use Powershell to list all content types and site columns in a sitecollection of a SharePoint site.

If you need to make a SharePoint site compliant and render pages without nested tables you will need to make use of a control adapter.

This post will show you how to provision Site Columns that uses Managed Metadata in SharePoint 2010 with a custom activation feature.