I like how it is persistent via localstorage - but what if I want to access my notes both on my desktop, and on my phone? Obviously localstorage won't work well for that purpose. But it would be nice if there were a way to be able to have this digital whiteboard be persistent across devices (phone, desktop, tablet, etc).
Also (and this is probably on your list) - can we get a way to draw on the whiteboard? Perhaps also some way to scale and move on the whiteboard (so in effect it becomes an "infinite" whiteboard)?
Lastly - branding: Rather than saying "start whiteboarding" - how about "start thoughtwriting". The name is good; use it as your brand for this product, and keep it all consistent.