If you haven't noticed when you were browsing, the ello devs have added a new feature... next to the FRIEND/NOISE is a button for Muting or Blocking.
They also added an option in notification preferences. I think a lot of people will be happy with the MUTE/BLOCK option. I can't see using it often, but it will certainly come in handy when we go out of beta and open up registrations.
Speaking of that... I keep reading about sites that have hacked invites; is that true, and if so, doesn't it defeat the purpose of the invite codes?