This an early version of an indie game available from http://kerbalspaceprogram.com/ - which right now appears to be a little bit overloaded.
It's a physics sandbox that revolves around building rockets and flying them into space, except that in the effort to get higher and faster you'll end up making them explode because you spent all your time on rockets and not enough time on the structure, or they'll be unstable and fly into the ground, or perhaps you get them airborne and fail to land because you skimped on the parachute budget. And then there's always the possibility a 'Space Oddity' type situation where you get your crew of fearless kosmonauts into space, but lack any ability to get them home.
It's currently free and there are a bunch of fan mods adding extra parts to increase the potential for mishap. I'm guessing at some point we'll see actual objectives or something added, but as it stands right now it's just fun for toying with and explodifying things.
War! (well kinda)
[youtube]D98QvmeOisw[/youtube] - This one uses youtube annotations to have the pilots explain what's going on.
Rocket Scientists Explaining How to Do it Right, but where's the fun in that.