Related to “Spots” in my pictures. :-(, I've discovered these lovely purple spots in all of my recent (1500ish) shots, but they're much different than his smudges.
I'm shooting with a Nikon D5000 + Sigma 10-20mm. Here's a crop from a random shot (edited in LR to make the dots more distinguishable):
What does it mean and what can I do about it?