Code:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule .* http://whereyouwanttosendthem/ [L,R=301]
You may want to add the R=301 to give the surfer a 301 redirect. The default mod_rewrite redirect is a 302, which is a temporary redirect and was the cause of 'google scraping' where the temporary redirect and resulting page were considered dupes.
If its an unconditional redirect, you don't even need the RewriteCond rule to be there.