I often delete versioned files from Visual Studio without great care for the source control impact.  However I eventually have to go through and clean up the mess I made by not properly deleting the files from svn as well as on disk.  When you delete a file physically but not in SVN, SVN willl declare the file missing. 

 For a couple of files a quick "svn delete foo.txt" will take care of the problem.  When there are lots of files this is tedious and prone to error.  That is, unless you have powershell.

# Used to do a "svn delete" on all missing files
function SvnRemoveMissing()
{
    $data = & svn status
    foreach ( $entry in $data )
    {
        if ( $entry -match "^!\s+(.*)$" )
        {
            & svn delete $($matches[1])
        }
    }
}