Unfortunately, self-promotion is a necessary evil in today's social world. People MUST know who you are and be able to see what you are doing in order to have people read your work. It's a fact of life and something that every mighty introvert needs to take to heart.
The good news is that it's getting easier to tell the world what you are doing. And... you don't need to spend lots of time in crowded rooms of people, either.
This post provides an example of this new technology. I've just signed up for a service called TwitterFeed which will sent a link to my blog posts to Twitter. Twitter is a microblogging system that's very good for sending quick messages (max 140 characters).
If you'd like to learn more about Twitter, Caroline Middlebrook has written a great guide that you should check out. Twitter is a relatively painless way for introverts to tell the world what they are doing.