[visual-studio] Should I add the Visual Studio .suo and .user files to source control?

Since I found this question/answer through Google in 2011, I thought I'd take a second and add the link for the *.SDF files created by Visual Studio 2010 to the list of files that probably should not be added to version control (the IDE will re-create them). Since I wasn't sure that a *.sdf file may have a legitimate use elsewhere, I only ignored the specific [projectname].sdf file from SVN.

Why does the Visual Studio conversion wizard 2010 create a massive SDF database file?