First thing is to try blowing air under the key to see if anything is under there. Compressed air makes this very easy. If the key still misbehaves, pop the key cap off by carefully lifting it from a corner. Check to see that the white "scissor" is not damaged or has any plastic broken off it. If all is well, just push the key back down to pop it back into place. If you still have the problem after this, I'd be surprised, but if do, I'm sure an Apple Genius can help out. As for an unresponsive trackpad, do you mean it's completely dead or it's skipping or what?
Steve