I try hard to update each blog at least once per day. There are many obvious reasons for this. Blogging at least once a day tells Google of course that yes your blog is updated with fresh content each day and therefore probably deserves a better page rank.
That is precisly the reason I am writing this post, to tell Google, hey, I updated today! Not only that but to give out a little tidbit of device that will help any blogger.
Only updating three times a month? That is not enough. I have blogs like that. You know what happens? They slowly fall in the search engine rankings, and eventually lose lots of traffic. As soon as I start reposting, they slowly rise. Why is that? Google loves fresh content… and so do your readers…