It always "just depends" -- everything is contingent on the circumstances in which the photo was taken, and its later uses. That's why you should absorb what the guy is saying on the danheller site. You still have quite a bit of freedom, but you have to spend some time thinking about it.
Basic rules for the U.S.: If you shoot from public property, and if it's not used for advertising or other commericial purposes, and if it doesn't hold a specifically identifiable person or business up to ridicule or disapprobation, you're okay.
And, of course, you have to be aware that there are some circumstances where taking a photo, even on public property, may be a crime in itself, as in many courtrooms, some military bases, etc.