Mac World is in progress and little geeky trinkets are beginning to trickle out. The keynote isn't until tomorrow but here's one of the most talked about so far:
It's an online photo management tool. It stores and organizes pictures mostly (but can work with videos as well)
There's also some basic picture editing and captioning tools. In particular you can lay out and decorate your collections (called albums) and it integrates with the rest of your Gmail suite. It has easy and controlled sharing tools built in.
Could be good for delivering and/or collaborating on storyboards.
It's been available for PCs for a while but you can now get the Mac version here.