That's pretty reasonable. I'll try to make more salient arguments next time. A Memo To The Internet is more of a rant board... but I'll start cleaning it up.
In some cases, yes I agree. But a chatroom is a pretty proven design. Scrolling output, user list on the right, input bar at the bottom.... and that's pretty much it.
I doubt even 37signals would claim they designed that.
It's like IE complainging that firefox also has an address bar at the top, and back/forward/reload buttons.
http://en.wikipedia.org/wiki/David_Ulevitch