BBCnews is carrying this report on the activation of an optical telescope who's sole mission is to detect light signals from extraterrestrial intelligences. Much like its more famous radio-based cousin, this is a completely passive process, so no worries about sending out "gullible and potentially tasty natives are here!" signals.

Then again, the first thing any of them will see is, what, I Love Lucy re-runs? Sorta says it all...