Someone asked me what Amazon Web Service is going to do next. For the past month, I've been thinking about this problem and what can you see from looking at the releases.
I'll write a post over the next couple of weeks on what I think AWS is doing next. Once you see it, it is hard not to think it has to be true.
Also, Netcraft has a report on AWS growth. With a pretty good estimate of the server count.

Geographic distribution of computers per EC2 region in May 2013
| Data Centre (EC2 - Web Facing Computers) | February 2013 | March 2013 | April 2013 | May 2013 | Growth (4 month) |
| Asia Pacific (Singapore) |
6,576 |
6,805 |
6,998 |
7,290 |
10.9% |
| Asia Pacific (Sydney) |
499 |
739 |
1,129 |
1,427 |
186% |
| Asia Pacific (Tokyo) |
7,342 |
7,595 |
8,065 |
8,601 |
17.1% |
| EU West (Ireland) |
23,778 |
24,635 |
25,326 |
25,942 |
9.1% |
| South America (Sao Paulo) |
2,115 |
2,263 |
2,396 |
2,655 |
25.6% |
| US East (Northern Virginia) |
87,094 |
88,543 |
92,426 |
93,537 |
7.4% |
| US West (Northern California) |
9,325 |
9,478 |
9,715 |
9,695 |
4% |
| US West (Oregon) |
5,217 |
5,573 |
5,965 |
7,051 |
35.2% |
| GovCloud (Oregon) |
14 |
17 |
21 |
27 |
92.9%
|