When you're meeting with a business client, you generally exchange business cards with them at some point. If you're looking for a way to quietly tell them that you're a huge geek, slip them a business card with Yoda on the front, that should get the point across.
GetSolo is selling these “social networking cards” with the official blessing from Lucas. You can choose two types of cards, the premium will feature your name on a strip running down the front with your info on the back, while the standard cards won't put your name on the front. You've got 73 different images to choose from, and a variety of different layouts for your info on the back.
If you're looking to show off your Star Wars pride, you can get the standard cards for $29.99 for 100, or to get premium cards you'll pay $59.99 for 500 or $74.99 for 1000.