pretty much all you have to do is pull up the "Announcements (Altcoins)" page and theres your list of scamcoins.
All of them? If there is a legit thing where do you announce than?
i was exaggerating a bit. some are ok, and the only way to find them is lots of research.
but on the whole most are junk: they pump, dump, exit and let them die. then on to the next one to repeat the process.