Tony Hsieh might seem like a low-key guy, but when it comes to being a great leader, he's a "shoe in."

E-mail is evolving. As you lay the groundwork for your 2008 plans, here are questions that might challenge and affect your planning.

There are more than 240 million mobile users in the United States. Because cell phones and personal digital assistants are the modern consumer’s constant companion, mobile marketing quickly is becoming an interactive marketing channel that can complement and enhance your other marketing initiatives and communication channels.

If you’ve worked in a marketing group for very long, you’re sure to have come across Web analytics reports of some kind produced by vendors like WebTrends, Omniture or Google Analytics. It doesn’t really matter where they come from or how they’re produced, the general gist is to somehow identify which of your online marketing efforts are working and which need help. But if you’re like most people, you might find these reports obtuse, full of archaic language and more confusing than enlightening.

Give a man a ride to the doctor’s office, and he’ll be diagnosed for a day; show him the myriad health research options available online, and he might never need a doctor again. Well, maybe not, but you get the idea.

Second Life, from Linden Lab in San Francisco, is an Internet-based virtual world that came to international attention via the mainstream news media in late 2006 and early 2007. It’s a source of endless hours of entertainment for scads of virtual-reality fans, but it’s more than just a fun fad.

If visits to a flurry of New York-based digital marketing and online media conferences this fall are any indication, the digital marketing revolution is here to stay.