Looking for Storyboard Software

I don't know if I have seen an exact match for eLearning as everyone's storyboarding process is so different.  That is really verified by the bazillion different types of storyboard templates out there.  I have tried software like Celtx which really does work well as a collaborative storyboarding tool.  But then, you could use a simple Word template and upload that to google docs for the collaborative aspect.  Best bet, look through a few templates and then create your own.  It might take a little time on the first go through but you'll have it for later iterations or presentations.