The SETI program is searching such a narrow spectrum, it's unlikely they'll find anything.
1. They're only scanning frequencies that we assume they would use (the frequency of hydrogen if I'm not mistaken).
2. They're assuming other civilizations are broadcasting "here I am" messages (why should they if we're not?)
3. Other civilizations may be too primitive to contact us, or so advanced that our communication technique is obsolete. It would be like a caveman using smoke signals to communicate with someone using email.
From the research I've seen, alien civilizations are likely to be 1000's, if not 10's of 10000's of years more advanced than us (they came up with this idea due to average planet supporting star ages). Radio may be a thing of the past for them...they could be using such exotic means of communication as worm hole transmissions or tachyon transmitters---who knows? It's also possilbe that they don't WANT to talk to us (maybe a Star Trek prime directive type thing). With the new equipment they're planning to launch in the next few years, we'll actually be able to see Earth sized planets around other stars. Soon after that, we'll be able to tell what the planet's atmosphere is made of and determine what kind of life (if any) inhabits the planet...possibly even tell what stage of development the life is at (by measuring polutants, carbon dioxide levels, and isotope levels through sprectoanalysis). I do indeed think that we will find other life within the next 40 years now that we have the right tools coming on line. As for contact...it'd be easier to find a target to contact first than to try to blindly pick one out of space.
Oh....and I also think they will cure athlete's foot once and for all!
