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If you are talking about "official" apps, then it would be Snapchat and probably Youtube.

...an official remote access client and the ability to join a domain (file browser). They have a huge opportunity to make this the phone of business but they are so intent on playing catch-up to Android and iOS. I just can't figure it out.

For me: Strava (although workarounds exist) and Pebble connectivity.

I'd go with Mint.

mint.com is coming. I got an invite to the beta for WP8 and Win8.

Google Hangouts.

Google will not be bringing their apps to Windows Phone anytime soon, since their interest in helping Windows Phone is zero and the market size is currently small enough that Google believes it can safely ignore it.

It will be up to Microsoft to prove them wrong. If Microsoft can continue to grow the number of countries where WP has already relegated iOS to 3rd place, perhaps there could be some sort of tipping point. But that's a ways off...