Discoveries of recent years, particularly of many other planetary systems, and possible surprising potential habitats in such places as Mars and Europa, have made much more plausible the existence of widespread life, including intelligent life, in the universe. At the same time, these and other discoveries have made SETI more challenging. No longer are single G stars the prime targets of search. F, K, and M stars and binary stars must also be considered potential abodes of life. The ultimate instrument for SETI is an all-sky, all-frequency, all-the-time sensitive radio telescope. This will deal with the transient signal challenge. Although the basic technology for such an instrument exists, the present cost is so high, particularly because of the enormous required computer capability that is probably decades away. It has become plausible that optical signals, particularly very brief laser pulses, might be a detectable extraterrestrial technology. It has been recognized that SETI signals could well be transient and detectable only a small fraction of the time. To deal with these possibilities, sensitive optical searches are now underway for nanosecond-time-scale optical signals. The Allen Telescope Array, an array of—eventually—350 six-meter antennas, is far along in its construction and will provide the ability to conduct continuous multi-beam SETI searches.