I posted a few photos of the U-Notch and glacier from Sept 14, 2012 that may be of interest. You can see them here:http://www.flickr.com/photos/79760202@N03/8001080965/in/photostream
The glacier exit up to the 3rd class that leads to Glacier Notch had black ice and ice covered with frozen sand-scree. We used an ice axe and crampons but still thought it felt dangerous because a slip would have sent us sliding into boulders below. I don't have much ice/snow experience, so it may have been easier than it felt. We crossed the glacier in the AM but avoided it on our return the next afternoon by downclimbing the icy sand-scree. It was nerve-wracking either way.
(We crossed the glacier from right to left (facing the notches), climbed Sill via the N Couloir, then Polemonium; we bivied then returned via Glacier Notch toward Gayley camp.)