What are the possible benefits and dangers of such a discovery?
Benefits...perhaps to unify our world in a common goal.
Dangers...our own short-sightedness and ethnocentric way of thinking may prevent what we actually hope to accomplish...contact and establish communication with other worlds.
Should humans transmit a beacon for others to find?
If so, what information should we send?
Perhaps information similar to what was on the Voyager probe. A basic representation of the languages of Earth, basic and advanced mathmatic formulas, our location/position in the galaxy.
Why do you run SETI@home?
In the hopes to find candidate signals for possible sources of intelligence beyond our world.
What are your views about the project?
While I think that it is important for resources to be allocated to the research of social issues and medical advancement, I also believe that it is vitally important to expand our knowledge of the "neighborhood."