Provide accessibility info and guidance
Since this tool is HTML and CSS-based, it's probably very accessible for people with disabilities. I'm wondering how accessible these presentations really are.
I'm an Instructional Designer who uses Adobe Captivate and Articulate Storyline a lot. These tools are pretty powerful, but they're lacking somewhat in the accessibility area. If you could build on the already-probably-pretty-accessible features, you could carve out a better niche for your product, I think...

-
Ellen commented
Has this been addressed at all?
-
Anonymous commented
Agree with anonymous--this is the one thing that is keeping me on PPT at the moment.
-
Anonymous commented
Yes! This is one thing that is keeping me from using slides.com and sticking with PPT because the latter has clear accessibility guidelines and a built-in accessibility checker.