Here's what is included:
Name, title, company (with hyperlink to company website)
Personal e-mail with hyperlink
Telephone numbers
Company motto (at top)
Visual links to LinkedIN profile, Twitter, Company FaceBook page, and this Blog
Opt-in sign up for company newsletter
As you can see, this is all accomplished in a compact, well-organized box. My regular contacts get used to seeing this, so it has become a personal logo / brand. The only challenge is that some people who view this on a PDA don't realize right away that all the "pictures" they see at the end of the message are just part of the sig box. But those folks are "Luddites" anyway
Create an attractive, simple, informative signature box for yourself, and help to have a personal brand.