Now that you have got some good answers, I will suggest to take initiative and start something new. Something like Friday free tech talk meeting, in which you can show them how to solve Rubik's cube.
It's a kind of development forum, where each member is free to talk about the technology or the product that they like, or they have worked with. Let it be open source or the personal or the college project. The idea is to create the environment where the developers will participate on their own. They can talk freely about anything in the meeting.
In my previous company, we used to have something like this, but it was concentrated around the patents. Each person will come up with the idea, to use the product in a new way. In the meeting we will discuss the idea, their advantages, disadvantages, challenges etc.
In the current organization there was the same idea, but somehow unfortunately it is turned into the progress meeting, revolving around the project. So that's another lesson. Developers should not be forced about anything in this forum, but rather environment should be created so they should participated on their own.
