Do you have a version page for your SharePoint site?

A custom list for Version should be created at the root level of a SharePoint site collection, and each time a package is deployed - a new record should be added to this version list.

A simple blank page with a Content Query Web Part can display this versions list in a friendly manner.

We do not change the version numbers in the .NET Assembly because the assemblies have to be strong-name signed and deployed to the GAC. So having a versions list is crucial in working out what version of your package is deployed on which server.