1. students can enrol themselves into groups (not by the teacher as in standard moodle)
2. The teacher can configure a max. number of group members in the group settings
The attached ZIP-File contains
1. a PDF with the presentation of this features at the Moodlemoot 2008 in March in Heidelberg/Germany
2. new files which have to be added to a standard moodle installation
3. the diffs <original file> versus <modified file> for the files modified
@Martin Dougiamas: We talked about this modifications at the conference, and you asked me to put them in the bug tracker.
Here it is! It was great to meet you in Heidelberg!