Joining Mind-Mapping.Org is an on-line diagrammer that has been around for a while:
Lucidchart
Lucidchart is a collaborative diagram-drawing application. You run it from your browser and build diagrams with pre-loaded shapes and images, or with your own images that you can upload. You can share these with others and track who made which changes.
It has several pricing options: Limited free access; $5/month for an individual; or $50/month for groups or businesses (providing 25 accounts).
The $50/month account provides for secure (SSL) connections and sharing images and templates across a team.
Vic
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about visual tools you never knew existed.
VIc,
Lucidchart is better than ever and you should really take another look. We just added the ability to expand and collapse different branches of a mind map.