Owner and Group owner of files in my home
This is normal, to some extent. It really depends on what you have in your home directory. My home directory contains root user files from applications that require system-wide privileges for updating, such as Adobe Air and Parallels Desktop. Under normal circumstances there's no need to change groups or owners of these files.

If you're worried about the groups and users of OSX's own files in your home dir, run Disk Utility and repair permissions. This will fix the groups/users of OSX's own files, including the ones in your home dir.