Back in the day (circa 2 years ago) after you wrote your post you needed a way to let your readers know that you have new content. A co-worker of mine at Harrisdirect named Lisa Perez told me, just send out an email blast whenever you have a new post. That was solid advice, but I'm too lazy to email my personal list.
I focused on search results rankings from day 1 and that pays off for me all the time but that attracts new readers. I subscribed to FeedBlitz for free which still works, but sadly I'm down to 28 subscribers now (I think I topped out at 150). Feedburner for RSS feeds is still a must have and I have 100+ subscribers, but in a Twitter world, you have to change your tactics. Here's why.
Right now I have over 185 followers and it grows every day. I get new requests all of the time and when I post a lot on Twitter I get a ton of new followers. I use Twitbin so it posts new Tweets from the people I follow and it makes it very easy for me to Tweet. I post work related meetings, personal events, but what is a must do for every blogger now is to post links to you blog articles. It is just basic good CRM now and you can't live without it.
Believe it or not, I think more Corporations should be using Twitter for short message updates too. Sure you can't put a lot of content in your Tweets, but at least you can write a quick summary with a link to your new content. I've had a love hate relationship with Twitter in the past, but I've worked out my own differences and I've been in the love category for a while now. Bloggers and corporations shouldn't ignore it anymore. Otherwise you might wake up one day and realize that your email list doesn't perform like it did in the past.