Does anyone have any good resources for videos about editing? Particular more advanced stuff - eg. layering, manipulating, blending, app stacking, Art Studio / PS style apps. I am really struggling to find anything - maybe they just don't exist? Maybe some of us should make some...

Here is one to get the ball rolling (although would prefer more advanced stuff than this)

iPonic Textures Filterstorm Tutorial - http://vimeo.com/60824771

Also incase you missed it there is a CultCast episode with @WithHearts from instagram talking generally about mobile photography - but also goes into some specifics of his editing workflow. His bit starts around 30minutes into the podcast. Obviously just audio, not video, but still worth checking out:

http://www.cultofmac.com/217989/take-amazing-iphone-photos-a-top-in...

Cheers

Tom