David Brin talks about SETI and many other things.
SETI - An alternate strategy
To date most SETI research has focused on the assumption that an advanced extra- terrestrial society will want to "communicate" with similar beings throughout the universe. But it is my belief that given the vast distances and time that communication via a "communications channel" even if it is one way, such as optical or radio frequency transmissions will be impractical. Instead we must look for extra terrestrial intelligence in a similar way we searched for signs of intelligence on earth prior to the modern age. We can not hope to communicate to prehistoric man, but we know that intelligent beings existed on earth thousands of years of ago through archaeological evidence. However for extra terrestrial intelligence we will need to look for "archaeological" radio frequency and other techniques where past intelligent beings may have created electronic equivalent to "cave paintings", "tombstones", "pyramids" or other records of their activities not so much to communicate to us, but to communicate to future generations of their own society. We need to look for ways advanced societies could have created perpetual signal regeneration as their signals propagated through space, or used wide scale and unchangeable features of the universe such as CBR as a reference plane. Rather than use point to point communications ETs may use an inter-galactic equivalent of Facebook.