Yes, outside the grid to the left looks good in a full browser -- but as you mention, that wrecks the mobile layout. I wouldn't worry about it too much -- where you've got it isn't bad, it's just a little hard to read on the busier background. Btw, on an iphone the max-height you're applying to .app_summary is causing a little bit of overlap: http://idea.s3.amazonaws.com/appdiem2.png.
Sure, feel free to email me -- address in my profile -- or just reply here.
For what it's worth, there is a much simpler (and uglier) mobile layout at mobile.appdiem.com (or m.appdiem.com, as soon as DNS catches up) currently -- I just haven't yet implemented user-agent detection.
If I go left of the grid, I'll probably use a vertical indicator, instead of horizontal.
Sure, feel free to email me -- address in my profile -- or just reply here.