It was kind of a small selection for iDevices last time i checked, but why not try GameFAQs? its the first place i would check
There are no hints or walkthroughs for any iDevice games at GameFAQs. It's pretty barren compared to the other consoles on that site.
i think right now there probably isn;t anything if you need help on a you can search these forums for strategy topics. or you can search the devlopers website or forums.
Try this: http://www.gamefaqs.com/portable/iphone/ It has the top ten games, the top ten faqs, and an alphabetical list of all the games they currently either have faqs or at least help discussions for.
i dont like youtube video review/walkthroughs becuase i sometimes have a hard time making out what theyre saying :/