Samsung Flip - A 55" digital white board from Samsung
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.
Vecta - Team diagramming on advanced SVG editor
Limnu - Sketch, share and collaborate with your team
Draw.Chat - Anonymous real-time whiteboard with text and video chat.
Witeboard - A real-time whiteboard for your team. No signups required.