If there is intelligent life out there, maybe it is looking for signs of life on Earth from such transits.

CNN: A transit of Venus, an age of wondrous science

Web sites abound for alien-seekers: people trying to prove there is life on other planets or that entities from other planets have visited Earth.

CNN: The Internet: the final frontier for space watchers

If there is life on such a planet, microscopic forms of it will probably live deep inside rocks, as they do on earth.

ECONOMIST: Panspermia: Interplanetary migration | The