For writing critiques and questions on technical writing, the closer fit within the Stack Exchange universe is Writers Stack Exchange. From the site's help center:
What topics can I ask about here?
Questions on these topics are welcome here:
However, I should warn you that I'm not intimately familiar with the site and I may be completely wrong when I'm saying that your questions would be welcomed there. You should read the rest of the article and the scope guidelines thoroughly, and decide on your own if the site is what you are looking for. Additionally, it wouldn't hurt if you stopped by the site's main chat room and ask its regulars for further guidance.
If, on the other hand, what you are looking for is feedback and general discussion for your programming blog post ideas, then the more appropriate place would be our own chat room, The Whiteboard.