Walt Mossberg of the Wall Street Journal recently tried out MSN Spaces and has a review in today's issue. His review Microsoft Service Lets You Create A Nice Blog, But Limits Tweaking contains the following excerpts

If you think that only techies can launch a blog, or Web log, to share their views with friends, family or the whole Internet -- think again. Numerous online services make it dead simple for anyone to create a blog, at no cost, with no technical knowledge whatsoever.
...
Google got a big jump when it bought a service called Blogger (blogger.com). Today, the company hosts an estimated eight million blogs. Yahoo is developing an elaborate service called Yahoo 360 (360.yahoo.com), which offers blogging and other features designed to connect people. It's currently in a test phase, open only by invitation.

Microsoft has just launched its own blogging service, called MSN Spaces (spaces.msn.com). Because it's the newest of the giants' offerings to complete its test phase, I decided to try it out. Microsoft says it already has more than seven million blogs in Spaces, and is adding new ones at a rate of over 100,000 a day.

My verdict: MSN Spaces is very well done. It makes it easy to create a simple, attractive blog with text, links and photos, and to customize the blog in interesting ways

The review was quite favorable which is great news for us because it means we've done a good job at hitting our target demographic. This is awesome given that this is just the first version. 

A number of the criticisms in the article related to limited customizability are things we are aware about and plan to address in future releases. Y'all should nag Karen with your ideas. :)

As for the number of spaces created so far, that isn't a typo. We've added over 2.5 million spaces since it came out of beta two weeks ago. 100,000 new spaces a day is actually a conservative number, we were seeing multiples of that number shortly after launch but I assume our current adoption rate will hover at that number for now.