Whilst it may not be possible for everyone to take branded USBs, pens or even branded foldable shopping bags this article gives some very useful hints and tip as to how to be an effective networker.
Once you are over the initial fear factor - ensuring you are personable, presentable and confident without being arrogant is a good approach.
Far too many people make the mistake of trying to pitch and sell to everyone they talk to. This is a huge mistake, it will push people away and leave you marginalised wondering why nobody wants to talk to you. Just relax and make small (and interesting) talk with other people, embrace them on a personal level and build real connections – it is about networking after all, not direct selling.