Sync Space for iPad provides a zoom able drawing space that can be shared in real-time over the net a sort of shared whiteboard. Turn on synchronization and send a link to the document to others who will be able to see your drawing and also make changes using Sync Space.
The resulting drawings can be posted to Twitter, 37 Signals' Campfire and Face book or emailed as a PDF.
lt’s the perfect whiteboard replacement for distributed teams. See a demonstration video a tour web site.