I don't think there is an IPS Blog. If there is please would you link it?
I think that our site could get more traffic if we had a blog. We would have to define exactly its contents, but we could use it to discuss different things IPS.
For example why some questions are put on hold and suggesting ways they could be improved so they could become valid questions.
We could also use it to talk about issues that have been asked in several questions and summarize different answers in a general good advice page.
Basically we could use it to go deeper in certain things we cannot right now because of the platform limitations. What do you think?
Also I am not sure how much work would it represent and who would have to write the blog. It seems like in ServerFault they have some associates that write blog entries.
Some SE background:
There was a Post on Meta about making SO as a Blog platform. There are some blogs live already: