"Newbie: Cluster based on multiple attributes?"

Original message from SourceForge forum at http://sourceforge.net/forum/forum.php?thread_id=2048818&;forum_id=390413

I am looking to cluster some 2D points based on their proximity to each other. I was looking at using the AgglomerativeClustering operator, but haven't been able to figure out what parameters to use.

Any suggestions on how to do this would be much appreciated.