Most domain registrars now offer private registration. In fact, it has been awhile since I've come across one that does not.
Daniel B., CEO - Bezoka.com and Ungigs.com Hosting Solutions Optimized for: WordPress • Joomla • OpenCart • Moodle Data Centers in: Chicago (US), London (UK), Sydney (AU), Sofia (BG), Pori (FI) Email Daniel directly: ceo [at] bezoka.com
Enom provides ID protect to make your domain registration private for $8/yr,but it's not available for .US names. Network Solution offers Private registration service for $9/Yr + cost of domain name.