My blog has a 132 posts. I really should have a lot more than that! I need to get back into posting again in my blog. If I start now I can probably have 150 by the end of the year (hopefully)!
I ran a blog in conjunction with my forum once and it reached over 50 high quality articles. We got one of the developers of myBB and some large plugin developers for interviews at the time, it was quite a decent blog actually.