If we’re looking at sales figures of 3.5 million units in the first year for a new laptop, smartphone, or camera, then we might be impressed. But 3D Blu-ray discs? When half were included in the box with aBlu-ray player? Man, that’s gotta sting. Those numbers are based on an IHS Screen Digest estimate, tallying US sales beginning in June of 2010 and ending last month, though many larger titles didn’t make their debut until later in the year. Still, if those results are even in the ballpark of official (unreleased) numbers from BD distributors, then things really aren’t looking up for 3D. With fewer than 100 titles even available on Blu-ray, however, we’re not really surprised that discs aren’t exactly flying off the shelves. Obviously, as a growing number of movies are filmed in 3D we’ll see BD title availability increase as well, but with the technology’s lackluster beginnings over the last year and no sign that consumers are ready to spend more to embrace that new dimension, 3D may continue its slow crawl toward the mainstream for some time to come.