The blogs of Unity staff are to be found here.
But I ask you, User, do you have a blog in which you talk about Unity? If so, you might want to reply to this thread with your blog URL and any other relevant details. An extra link never does any harm, does it? 
After joining Unity I’ve turned my blog into more of a Unity tips tricks place. I’ve recently been a bit behind on the posting as the gears have been turning quite fast within Unity, but I’ll be trying to update it as much as possible.
I keep a blog mostly to keep track of my own development (when time permits).
I’ve been making web games since about 1999, and I’m finally catching up with this whole “web 2.0” stuff 
As such, I’ve just published my first blog post, comparing Adobe Shockwave to Unity3D - and why I switched.
However, I will be adding more in the way of useful code, experiments and pet projects as time permits!
My blog is pretty random, but there’s Unity stuff (and I have some Unity blogs listed on the blogroll)
Not sure if I could as “Unity user”, but occasionally there is something Unity related: Blogs · Aras' website
I’ll add the blogs above, but I’d like to redirect the attention here to the following:
Unity on the Web – Using Reddit to Keep Track
And of course directly to the reddit.com pages in question:
http://www.reddit.com/r/unity_blogs/
http://www.reddit.com/r/unity_games/
http://www.reddit.com/r/unity_sites/
http://www.reddit.com/r/unity_tutorials/
This isn’t really a blog, but it’s like a blog in that it’s a mess and I dabble with it when I don’t feel like doing real work:
http://www.technicat.com/games/unity.html
For some reason, my access log shows a lot of downloads of the PDF version, but I have no idea from where.
Just your basic indie game studio wanna-be blog. Mostly has information on where we are, and what we are doing. Does have a section for reviews on Indie games, but not necessarily Unity ones.
you have a pdf icon just under the article dates - top right
I meant why there has been a lot more downloads of the PDF than the HTML version, but mystery solved - turns out the pdf link was submitted to reddit a couple of months ago (thanks, diamondtearz!)
Waddlefarm.org is my blog.
About 75% of my blog is Unity-related, and the other 25% is industry related.