Now and again I come across code with hardcoded SharePoint IDs in it. Or scary loops matching a field, list or property name. SharePoint provides some classes containing the out of the box IDs, you only have to know they exist. I made an overview so nobody has to hardcode those pesky GUIDs, ContentTypeId's or property names.

Working on a Project Server project we discovered it's quite easy to get issues with data integrity when users start retracting and deleting timesheets. After discussing the issue with Microsoft they gave us a workaround which solves our problem.