There were 2,194 skills live in alexa.amazon.com at 10:00 AM EDT, Friday, August 5.
488 more than July 15 (three weeks ago). +8%/wk
On Oct 16, 2015, there were 21 skills.
NOTE: Many thanks to Quentin at http://www.alexaskillstore.com for the tip on how to get the current count. Which is to search for skills in alexa.amazon.com using the * (asterisk - the wildcard character in SQL). So simple!