In reply to DefenderKen:
"Ask" near Barker's Pool. Nothing especially special but pretty good quality and reasonably priced. Pizzas are awesome. All meals £7-15
Other eateries: Devonshire Cat, so far the best pub food I've had in Sheffield. (Living here 3 years). All meals £7-15, awesome selection of ales. Home made pies are particularly good.
Really though, you should check out the pubs closer to the crags. The Millstone is very decent (try anything with one of their mashed potato options). The Little John in Hathersage is my favourite though, but it's not everyone's cup of tea. Average, dependable, ordinary quality pub food served in massive portions for a reasonable price. (You probably won't finish the mixed grill, but it's worth trying).
Routes: My favorite Stanage route is October Crack (diff). People will say Flying Buttress, but it's horrid really. It's polished so much that it's slippier than most limestone routes. I haven't done much on Stanage but I would definitely recommend October Crack.