I typically keep an eye out for people buzzing about ICO's on this forum. It seems like if enough long-time members are excited about a project, it's pretty likely that they've done their homework and found the project to be worth looking into.
in most cases, many old-timers rely on their intuition, and how they can determine the project's prospects. I, too, many times draw attention to the actions of the legendary or heroes of the participants, I explore their example. But you need to learn more about the selected projects, and learn to analyze and make choices yourself.