Now that you have a blog. Wait...your association does have a blog, doesn't it? You need to have an RSS feed established so that others can subscribe to your blog.
You know when you see that orange square with the white rainbow in it? Yeah, you can do that through FeedBurner. They call it "burning" a feed. It's not the easiest concept to grasp, but it is vitally important.
Here's a linked to a great video explaining RSS. It explains it better than I ever could. Once you get it, you get FeedBurner.