Google maps. I live in Japan and I don't read Japanese so it's extremelly helpful. Even when I was living in London 2 years ago, I was quite upset during the two months Google maps was not on iOS.
What are these applications doing?
Do you want to turn these applications completely into Single Page Applications or you just want to have some clean JavaScript instead of the old school jQuery?
I don't know if it counts as "advice/tips" but I follow many blogs and a few periodic lists of news and articles like this one for .NET http://blog.cwa.me.uk/
and this one for JavaScript http://javascriptweekly.com/