In reply to Route Adjuster:
Off the top of my head, unmissable routes are:
Flying Dutchman
Phantom Slab
Storm
Clapham Junction Direct
Double or Quits
Tricouni Slab (VD but brilliant)
Secretaries Direct and Superdirect
Damnation
Resurrection
Pine Wall
Shergar
The Web (think this is E2 but very safe)
Kraut
Spike Direct
-----
Make sure you go to the gorge area. All our Yesterdays and Conscription are brilliant and if you feel on top form, Plague of Blazes is a contender for the best route in the glen though it's bold.
Bear in mind my info is 35ish years old so some routes might have changed character and certainly grade.
There are routes I can't remember the names of, I'll see if I can dig out my guidebook and check but that lot would keep you occupied for a bit.
Post edited at 20:54