Can I somehow draw in the slides?

Can I somehow draw in the slides?

I use Powerpoint at home to create quick and dirty storyboard for my
independent films. What I do is draw a quick image (just pencil tool)
in Microsoft Paint, select all, copy, go to Powerpoint, paste, make
new slide, repeat process. I put any storyboard notes into the
'speaking notes' section of PPT. It's then easily sendable to other
ppl and I can use MS Word to print the PPT presentation in a nicely
laid out format similar to classic storyboard sheets.

I've been experimenting with adapting this workflow with Zoho Show
I'd love to use it with Zoho Show as then I can simply give access
to the document to other people and they can make adjustments straight
into the file. No more file-chasing, making sure everybody has latest
version, didn't forget any changes, etc....

Is there any way I can draw inside of Zoho Show? Any suggestions as to how I can adapt my current storyboard workflow into an online workflow? Are there any other online services like Zoho Show?

I don't want to save every image onto my computer, and then upload :(.
I'm too lazy for that, that's so Web 1.0.