web 2.0 tools (thing 19) revisited

A year later and most of the web 2.0 sites I've been able to find (and which hold any interest for me) still have the problem of requiring registration. I reached sign-in fatigue long ago, in part because of the inherent hassle of doing it, and of coming up with yet another username and password (and remembering them). And in part because the very act of signing up, of giving my name (even a pseudonym), feels like one more commitment to keep up with.