1) I believe in extraterrestrial forms of life!
2) SETI is very nice and interesting project!
3) I would like to see some kind of framework or system similar to SETI, where I can submit my own numerical code for the distributed calculation. In order to run own code each user of the system should collect some points running other people's numerical codes. I guess it will be very easy to implement. (I wrote this in 1999, and it exists now! :)