The Project Charter can be looked at as a contract between you and your project sponsor or you and your manager. It documents your understanding of the expectations of the sponsor and what you are expected to deliver and when. Like any contract, it should be concluded with a signature indicating agreement.
Why get a real signature? It is amazing how people will pay close attention to what is in a document when they have to sign their name to it! I have seen cases on my own projects as well as those I consulted on where misunderstandings are cleared up prior to charter sign off. This has and will save many hours of effort avoiding taking a project down the wrong path. For these reasons I highly recommend getting a real signature and posting a PDF image of the Project Charter in the project repository.
Once you have a signed-off charter, you now have one of the deliverables subject to formal Change Management. Any request that would change any component of the charter should have a formal change benefit/impact statement signed off and the Project Charter should be changed to a new version and signed off again.
In my next post we will move to the Planning Phase and begin a multi-part discussion on the Project Management Plan.