It's a bit hard to pinpoint sales since Amazon waits so long to post results (Smashwords is virtually instantaneous), but the current results shown are:
Amazon US: 11 sales
Amazon UK: 2 sales
Amazon Germany: 0 sales
Smashwords: 3 sales
B&N (not available until Smashwords accepts into Premium catalog)
Kobo (not available until Smashwords accepts into Premium catalog)
So, a grand total of 16 sales in two days. Obviously, that rate won't necessarily keep up, although I have a variety of people who are reading and planning on reviewing, which should help.
According to a statistic I saw today (unverified), only 5 out of a 1000 books published sells 100 or more copies. Using that as a very rough benchmark, I have 84 copies left to sell to break into the top half a percent. Scary!