People often talk about building your own personal brand, and what a great way then getting your own business card. One that you can give at networking events, and one that markets your blogs, podcasts etc
I love Hugh Macleod at Gaping Void - often near the knuckle but with his cartoons he hits the mark. He offers his cartoons as business cards and I have ordered mine - not to promote a business but to promote the skills that I have outside of work. Great point to remember is that these cards with your own mobile or home telephone number means that if you move companies...people can still find you!