depends on the blog i think. some blog will be fine with one post per week, other will need multiple posts per day
You create only one per week Unique Quality Some thing different and let others know that, you have created a new Blog thats it. more than enough.
I personally think that too much is just as bad as too little. 2-3 articles per week is what I would aim for.
I think consistency is important - better two post twice a week, on the same day every week, than daily / several times a day for a while, then no posts for a while... then back again. As long as people know that you always update on a Wednesday, for example, they will make a point of coming back on that day.