Why should I learn Qt?

[wysota]

I have some free time, and want to spend it in gaining some knowledge.
Have heard of Qt but thought learning something without knowing its worth,
may not be helpful, so decided to trust the seniors here.

I suggest to visit this place: http://qt.nokia.com/learning/education/course-materials

There are a bunch of lessons and exercises here about Qt. They are mostly meant for academic purposes but I guess you can learn something from it on your own as well. It should at least give you a hint on what to expect from Qt (at least parts of it). By the way, any feedback on the materials is welcome.