How do you inform users of new features?
timzon_dot_com: Interesting subject.
I just finish posting about a new feature 5mn ago 
 1. I write a blog post about the new feature (http://blog.snapabug.com)
 2. I send a link to the post through our Twitter (@snapabug)
 3. I send a link to the post from our Facebook Fan Page.
I will then later, add this new feature description to our monthly email newsletter.
I'd be curious to know how others do it too.