Nice!
At ScRiBLink you’ll find a free, powerful whiteboard where you and your colleagues can work on your ideas together.
No registration is required : )
 
Additional features like
– picture upload
– chat
– math functions
– multiple users
– ….
give you a good base to start sharing concepts online, etc..
 
Note: Maybe it’s not working behind corporate firewalls because it uses additional tcp ports.
 
 

 
If you know about alternatives, please comment.