Renaming your SharePoint web part namespace

http://donalconlon.wordpress.com/2010/06/30/renaming-your-sharepoint-web-part-namespace/
http://stackoverflow.com/questions/211241/how-do-i-rename-a-project-folder-from-within-visual-studio
http://social.msdn.microsoft.com/Forums/en-US/csharpide/thread/d4133fb7-57e1-44f2-a319-a63e7921ff0a
http://stackoverflow.com/questions/2043618/proper-way-to-rename-solution-and-directories-in-visual-studio
http://www.codeproject.com/Articles/370484/Rename-Visual-Studio-Projects-and-Resolve-Related
http://www.jetbrains.com/resharper/features/code_refactoring.html#Adjust_Namespaces

http://msdn.microsoft.com/en-us/library/6kxxabwd.aspx
http://msdn.microsoft.com/en-us/library/vstudio/ee231517.aspx

http://msdn.microsoft.com/en-us/library/ff872401(v=office.14).aspx