BaiBoard is a great multi-content collaboration app on iPad that enables users to collaborate in real-time via shared whiteboard, PDF docs and sharing with web browsers.

oad apps.
Live collaboration via:
1. Zoomable multi-page whiteboard.
2. Collaborative annotation on PDF docs.
3. Screen Sharing from iPad to web browser.

BaiBoard - Collaborative Whiteboard / Collaborate on iPAD / PDF Collaboration

* Collaborative, with easy-to-use drawing interface.

* Collaboratively Sign & Annotate Documents in real-time.

* Import & Share documents from Dropbox, GDocs, Email, iTunes and Evernote.

* Facebook integration for easy collaboration with friends.

* Cloud services for collaborating, sharing, storing, viewing with both drawing and chat.

* A variety of drawing tools and built-in stencils.

* Instant snapshots, storing and retrieval any stage of your drawing, all on-demand.

* Push to Talk.

* Publish and share your ongoing or previous BaiBoard sessions via Email, Facebook, Twitter, Evernote and Tumblr.

* View Canvas and PDF from any computer or device on same network using web browser.

* All data (diagrams, chat history, voice, snapshots) of meeting session are persistently stored. Your meetings can be stopped and restarted at any time.

* SSL connectivities, Password protected, Encrypted storage.

* No registration, No sign-up required.

* Collaborate with the BaiBoard Mac version.

Get it from here