What if the twitter fed coordinates of all the radio telescopes were piped to a 3d twitter vision globe, and you could see all the directions that all the radio telescopes in the world were pointing like a giant grapefruit with cheese and pineapple on sticks stuck in it. Different frequencies could be represented by different fruit, and you could see from the direction they were all pointing in which bits of the sky were being looked at and which bits the aliens could sneak in and attack us by. Then over time you could do a sort of time lapse animatin to see the sweep and flow of radio astronomy acros the sky. That would be pretty.
This is my idea #1 for hackday.