So, this is interesting, and while datacolor have had a Spyder option for a while, its calibration is limited to its own software (unless it’s changed since I last took a proper look at it).
This new offering from X-Rite, released in March, looks rather good, though, and it seems it has an API that allows other app developers to add support for the profiles it creates (meaning other software can show your images correctly, too – Hello? Lightroom Mobile? You listening, Adobe?).
There are, however, a couple of things that annoy me slightly about it, although one kind of negates the other (for me anyway).