Bryan Irace’s proposal for an iOS-standard in-app browser component, like the standard Mail-compose sheet.
I’d love this. I’ve tried just kicking people out to Safari for links, but they hate that — everyone wants built-in browsers. I’ve written a handful of them over the years, none of which were as good as Safari, and none of which were good uses of my time.
The main problem is that they’ve each had some customization to look or work better in the app, and a system-standard one wouldn’t have been as good. iOS 8’s extensions mitigate this somewhat, but not completely.