main page - login as guest or anonymous

from the main page,
http://labelme.csail.mit.edu/Release3.0/

I don't see a way to just start using it, without having to faff around with registration (email, passwords, usernames).

it would be better if you can just dive in. You could still record the IP of contributions, tag them as 'anonymous'/'guest' or whatever, and retroactively validate them (if clients want to filter contributions from trusted sources). Given 'anonymous contributions' a 10% weighting or something, if you're worried about a higher probability of damage

Start at the LabelMe main page, http://labelme.csail.mit.edu/Release3.0/, and inspect the current registration and login flow. Done means a visitor can begin annotating without registration while contributions are identified as anonymous or guest for later validation or filtering.

Written by the indexing model from the issue text.