Lauching a HD video camera into space using a balloon. And retrieving it in one piece.
It's like Google Maps...for space. Wikisky is a draggable, zoomable, web-based star map. And if you click on a star or other object, it brings up a page with all the information you could want on it, including recent articles and astrophotos that contain that object. And it does lots more. Go explore.
Imagining the Tenth Dimension (Flash). 10th dimensional physics and string theory don't get any easier than this.