This is great, I've been thinking in a similar about something like this for 'visual debugging', for a livecoding tool.

It would be great if this could recognise some common image formats in memory (cairo surfaces, PIL) and visualise those on mouseover.

Possibly similar for arrays - be able to visualise it as a wave or even playback as audio.

Is there any chance of factoring out the support for the popouts? - It would be great if this could appear in other editors.