@SPower yeah, this could be realy a good idea... They need to add to the collections some option like '[✔] everyone can post it's scenarios to this collections' and add to the greenfoot-Exporter/Publish frame the option choice: '[✔] Post to existing collection: [...]". The scenarios posted to a collection wont show up in the main thread but will inform the owner of the collection. Or something else.... I think (well, i am realy not an expert at something like that) these changes aren't hard to code :)

Some forums created sub-zones, like folders or groups where others can post their results instead of posting it into the main thread. This would be a good idea for Greenfoot.org too ;) (maybe an extension to the so called 'collections' we use now?) So teachers can create folders for each project they want their students to do; they can easily look up who uploaded his scenario to the folder; and the main thread doesn't get spammed by group-projects :) However, to see that teachers use greenfoot as an education platform - this is what greenfoot was designed to be, right?

The chat server is now finally closed. So this scenario doesnt work any longer. Feel free to contact me if you want to know the code for client (greenfoot/java - html/javascript) and server (java).