Even if you're just a one-man company, having a company e-mail address like your.name@yourcompany.com makes you look a heck of a lot more professional.
Don't focus on handing out as many business cards as you can when you network. Try to get to know people and build up a relationship instead of giving them a piece of cardboard.
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Look people in the eyes when you're talking to them. It shows sincerity, confidence and interest in what they have to say. Careful not to stare though!
Be sure to have a firm grip when you shake hands -- it makes you look confident. A loose handshake makes you look weak and like you don't know what you're doing. This goes for the ladies too!
Try to listen more than speak during conversations. It makes the other person feel great to know they're being listened to.
When you're back from a networking event and need to follow up, invite people to LinkedIn through their invite tool and include a custom message (not just "Please join my network") This way you can expand your LinkedIn network while you follow up, killing two birds with one stone.
Keep a few business cards in your wallet or purse, so you'll always have some to spare when you meet interesting people
Always carry around a box of breath mints -- you never know when you have to creat a great impression. Gum works too but is messier (and looks less classy when you're chewing it)