I have to agree with this (http://blog.marketingprofs.com/2006/06/w_why_blog_post_frequency_does.html) post about blog frequency.
It is quality that is important, not quantity.
I do think there is some importance in posting every so often, otherwise some people will think that you have gone away. Post too often and the reader becomes overwhelmed in some junk, or as described in the article a land fill site.
I have to admit sometimes I’m not so clear in my blog posts, but that should hopefully improve over time.