[gojomo]

You could possibly snapshot the page when the recording happens – if the page changes a lot – so the playback still makes sense.

I could scroll the displayed page, but the cursor still seemed to be moving about as if at the original viewport offset. At one point it seemed to snap back.

The interaction has potential... I almost grok the filmstrip of frames right-and-left... but not quite how cursor time-series interacts with the frames.

Yes, I'd agree a possible application would be recording web-driven presentations. With no install required, it could be better than existing 'screencasting' options. More tools to mark up a page with annotations/overlays could be helpful for that.

Watching users interact with sites, if normal clicks rather than intentional drag-opens can be enabled, might be interesting for remote usability studies.