From that first link above:

Download your local areas, trip destinations, or all 75,000+ routes

Is every *&^%$#$ route in the world available on an iPhone? Were we all born too soon?

the one that I appreciated, we were at Rumney this summer, and Jannette who was with us has all the imaginable electronic bells and whistles (aka: apps.) so there was a thunderstorm kinda forecast but we were climbing, then hanging around by the crag so she whips out her Iphone and can see the storm approaching on the weathermap just as we can hear the first thunderboomers!! that's when we hightailed it for the car.
Oh wait, we probably would have done that without the Iphone just the same, lol!

LOL.....yep we need iphones to tell us we're about to get hit by lightning. I'm being slightly snarky, Smike and I have used that app for everything from roofing my house to driving through crappy weather, to bailing of routes.

Mapquest - free turn by turn navigation
Accuweather, The Weather Channel - just to get a consensus
Facebook, G+, foursquare, LinkedIn, Groupon, LivingSocial, RueLaLa
OpenTable - look for openings and make reservations
Menu Pages - look up menus
How to Cook Everything, Epicurious, Allrecipes - recipes!
GasBuddy - running low on gas, where's the nearest/cheapest one?
IMDB - hey, who's that actor? What else whas he in? It was... shoot, it was a few years ago, with Kevin Bacon...
Shazam, Soundhound - What's that song that's playing?
Bookworm, Words w/ Friends, Drop7, Jumbline - various games
Frotz, Rogue - old school games!
Plants vs Zombies, Angry Birds, Cut the Rope - popular games that got boring after a month
BBC news, CBS Sunday, NPR News, PBS
SteepAndCheap, DealNews - watch deals
Photosynth - live photo stitcher from Microsoft
Dragon Dictation - cool dictation app
AllTrails - interesting trail locator, haven't really used it
TNF Trailhead - ditto
Avenza PDF Map - download free USGS maps in PDF and import into Avenza. Pretty cool, but the maps take up a *LOT* of space.

Hmmm. Best apps huh? Well, chicken satay is good, and a little spinach artichoke dip is good for sharing. Perhaps some crab cakes?