The pillars are pretty much gospel these days, though I have to admit that I'm a little iffy on number 3. Perpetual beta. Me, I want software that works, not explanations for why it doesn't (and I get enough email about my site to know other people feel that way too, even about noncommercial web sites). The question not is whether these are all the pillars, or whether there are more. And do we need them all? Who added "rich user experience" to Web 2.0? It wasn't there before. Via Judy O'Connell.