One of the most misunderstood points of Blogging is concerning your “content freshness” factors.
Content freshness: Write lots of good interesting content and post to your Blog consistently. How often? The more often the better. Just remember that you are writing for your readers who are pinged when you post a new update. But you are also driving the search engine robots wild with a blog that seems to continually have new content on it.
Posting shorter Blog entries on a regular “hourly” basis is even more effective than posting on a “weekly basis.” It’s not hard to do once you understand the importance of consistency.