FYI: the lowest panorama (titled: "Y Garn and Nant Ffrancon, from Y Cribin, Glyder Fawr Photo by JoeHarris") has a vertical scrollbar on my screen (IE7).
You've pulled together a lot if information here in a very nice way.
Years ago I wandered over these peaks and it remains as a very fond memory. I didn't know about jumping between the two rocks on the top of Tryfan, though. I guess that I'll have to go back some day.