I guess in 1.7version there should be some improvements in the blog:
1) There should be categories so when admin is posting something , there should be check-boxes that gives category names like (technology, science , history, general etc - these categories should be added by the admin) , and there should be a column on right side of blog page where all the categories will be displayed which makes easy for the website visitor to filter posts
2) On the right column there should be months displayed of the current year so that anyone can see posts according to specific months also
3) on the right column it should display recent comments too that were posted on the blog along with the username
4) Enabling TAGS feature with each blog entry, so that visitors can filter blog entires with TAGS
There is an open-source web application "blogenginer.net" which is really good, i guess nopCommerce team should get some idea from there and implement those things in nopCommerce 1.6 version , it will make nopCommerce blog feature to stand with famous blogging websites.
For More info about blogengine.net
screenshot / demo of blogengine.net