I have a few for you.
In Japan, there are 3 major emoney options.
One is called Edy, which has an app for NFC devices, and there's usually an Edy app available for many of Japan's non android phones as well.
Edy allows you to apply a credit card to the app and charge your app with funds. You can then use your phone to pay for things at convenient stores and whatnot.
Edy itself does not, however, directly pay for train passes (train gates have NFC readers, a bit on that in a moment).
There are 2 e money options for paying for train fees in Japan- Suica and Pasmo.
The most common way to use either is to buy a plastic NFC card which you can charge at machines at most train stations and convenient stores, using cash.
These cards can then be swiped over the train gates' NFC readers. The card is noted with your first location, then noted again at your destination and deducts the correct amount depending on distance traveled.
Both Pasmo and Suica cards can also be used on compatible vending machines, convenient stores, taxis, buses, and more, just like NFC cards here in America.
To my knowledge, neither Suica nor Pasmo have a specific app on any of the major mobile markets (iOS/android).
However, I do believe you can add your Pasmo or Suica card to the Edy app.
You can also use an app called FareBot to read your Suica and Pasmo cards to see the current balance, but that's it- it's just a reader.
Im summary:
FareBot can read your Suica, Pasmo, and perhaps many other cards to tell you current balance.
Edy app can be downloaded. It's region specific. People without a phone purchased in Japan may need to use this mod to remove country restrictions.
http://xdaforums.com/showthread.php?t=1582422
Then, you can add funds to the app, as well as use the app to utilize the Suica and Pasmo payment options, meaning you don't need your card! =D Just swipe the phone as you pass through the turn gate!
I haven't actually used the Edy app, so I don't know the exacts about it. If someone uses it, please reply with what exactly it can do to keep others informed!
For those in America, there seems to be a really awesome multipurpose wallet app in the works called Isis. The intention seems that it wants to be the most versatile, allowing you to add loyalty cards, coupons, credit cards, etc... it's not even released yet, and it does way more than google wallet. Here's the link to the front page. From there you can navigate to the news and follow them for updates. I'm looking forward to it.
http://www.paywithisis.com/