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.