Okay, so you know the field at the bottom of the post field when you create a new post? That field is, indeed important.
If you want an organized blog, a really good way is to label all your posts. I did mine and it didn't take long. When you view your post and click a label, it will bring up all the posts that are associated with that label. Then you can create a sub navigation like I have for your blog. I've been doing this for awhile and its probably the best way to navigate through your blog and to organize it. :-)