The news that QT, purchased by Nokia last summer, will now be available under the LGPL license is good news for developers on mobile and desktop platforms.
While nobody was really restricted from using it before, the choice between using the GPL version (give up your own code) or commercial (with fairly high licensing costs) did limit the audience somewhat. This move should help resolve that, in effect taking away one of the most significant obstacles to adoption.
This is attracting the most attention from the Linux hordes (where QT has long competed with KDE as the toolkit of choice), but I think the real value will be for users on other platforms (especially mobile), particularly as Nokia's resource are used to improve it.
It'll be interesting to see how this evolves, and what sort of secondary effects it creates.