I don't necessarily think that you have to directly sell yourself to successfully network. To me, schmoozing is a more social kind of networking. Having an open conversation about something you can intelligently speak to with the right person can make all the difference. You don't have to go down a list of your successes and skills. You don't have to sell yourself, you just have to get the word out. Let people know what you are interested in and that you are looking for a new job. Plant those seeds. Give people a way to contact you should something seem like a fit. You don't have to pass out cards but make sure there is some way to contact you whether it's through a friend or another colleague. Also, checked out LinkedIn.com which is a business networking tool and look for your old clients in there. They can even right recommendations for you. From one introvert to another, good luck!