Information (you may want to take note of the comments about the Ledge Trail, as it is consistent with comments that I have heard from other sources. An excellent message board for all things Yosemite:
Yosemitenews.info :
Sierra Point Trail Thread Link (Ledge Trail, i.e. 1.5 mile trail, from Curry Village to Glacier Point)Yes, I've done it, and yes it's not too bad, but I've seen too many rockfalls cross it in recent years. As far as I'm concerned, it is currently a death trap, and will be until the rock face settles down again. Thread Link 
