They all do exist, while the pagination is missing. I wonder if that's intentional, since for example the Sites area does have pagination in place. If someone wants to browse older blogs in the meantime, here are the URLs.

http://www.boonex.com/unity/blog/home/?start=10
http://www.boonex.com/unity/blog/home/?start=20
http://www.boonex.com/unity/blog/home/?start=30
http://www.boonex.com/unity/blog/home/?start=40
http://www.boonex.com/unity/blog/home/?start=50
http://www.boonex.com/unity/blog/home/?start=60
http://www.boonex.com/unity/blog/home/?start=70
http://www.boonex.com/unity/blog/home/?start=80
http://www.boonex.com/unity/blog/home/?start=90
http://www.boonex.com/unity/blog/home/?start=100

Would see more be good to have the pagination flipped on for blogs though, as the average lifespan of a blog is longer than it takes for it to get bumped off the grid by the latest 10 new blogs.

You can get the latest 20 from the bar at the bottom of the screen, with the following URL: http://www.boonex.com/unity/blog/latest

Overall it looks like a lot of functionality has gone amiss with the latest Unity upgrades. For one, the tag listings atop the page are now the predominant feature, while it makes make more sense (at least to me) to have them as an accessory somewhere on the side and not at the main point of focus.