Very well put. I'm afraid to walk through the sign up process because of all the exposure it apparently turns on. E.g. creating a public Google profile. I don't WANT a public profile, and I don't want to spend a bunch time hunting down and turning off all the things that the Buzz flow apparently turns on -- and worrying about what I've missed. E.g. it hooks into my Reader account? Picasa? Good grief!
I tend to remain respectful of HN and to try to keep my discourse constructive as well as emotionally balanced, but I really can find no other suitably expressive comment upon this than, "Fuck you, Google."
Problem with these things is not quite knowing what you're getting into - as witnessed by the yelps of surprise/outrage going around. Then having to spend time digging up obscure settings and tweaking lists. Then still not knowing if all the peepholes are plugged ...