Oh how I wish. Neither Visual Studio nor Refactor! refactorings support renaming namespaces.
I think there are issues on how these tools can track changes once the namespace actually changes. Making replacements afterwards breaks the Code model in memory. Just a guess, but I'm sure it's occurred to the Refactor! folks before - it if it was more easily doable it could be done.
However, I typically use a search and replace in files and that works fairly well and is quick..
+++ Rick ---
>Bringing in stuff from other people's Prism samples, for example and need to reset namespaces.
>
>VS 2010 - seem to remember there is a clever way to change the namespace on a lot of files at once ( yeah, I know I can do a global search and replace but I thought there might be one place I can sync namespaces - or a 3rd party goody that does it )