This 4 page Computerworld article highlights 8 areas that could potentially compromise security is misused in the corporate environment.  This includes:

1. Instant messaging
2. Web mail (non-corporate email accounts)
3. Portable storage devices (flash drives)
4. PDAs and smart phones
5. Camera phones
6. Consumer based VoIP services
7. Downloadable widgets
8. Virtual worlds (role-playing environments)

Corporate Security - Eight dangerous consumer technologies
http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9034278