You can measure the popularity of a website in a couple of ways, with a handful of different counters. One way is unique visitors. If you click on Sphere today, you're counted as one unique visitor. If you check back in the afternoon, you're still counted as one unique visitor who has had two page views. If you click here tomorrow that's your second unique visit. A rough analogy is newspaper circulation -- a paper might have a circulation of 200,000 (roughly analgous to unique visitors) and a readership of 400,000 (analagous to page views).
Sphere has had about 14,000 unique visitors in a year, and 25,000 page views. In our first full month, last December, we had 530 unique visitors. November of 2005 was our busiest month, with 1,800 visitors so far. (Lots of people who view the site don't get counted, but the statistics constitute a kind of index of readership and are good for showing trends.)
By the way, here's the first post, which is the only one Gina has written (it was basically a test, to help us figure out how to do it and what it would look like, but among other things it shows that blogs can take different directions and have different styles).
To regular readers, occasional readers and those who get here by accident -- thanks, and check back often. We hope to get bigger and better.