Finding organic living matter on other planets would be fantastic, but unfortunately that wont be the first kind of extra-terrestrial life we find (prospective there is any).
Our most advanced instruments are just now able to detect exoplanets, and soon enough they may be able to actually scan the surface for signs of life.
If we COULD send instruments there that could detect microscopic living organisms, we might actually have a lot better luck at finding life.
This just isnt feasible currently, and were going to have to stick with superficial surface scanning for creatures crawling around until we can actually send instruments there that could report back.
If we did find intelligent life, I think it would be a good idea to send a rocket with a screen and dvd player or something, with a big red button on it that plays it. Imagine being on Earth 200 years ago and finding something similar, with videos of aliens and things.
It would have been revolutionary, and eventually we may be able to greet another intelligent race in a similar fashion.
Oh the possibilities..