Must have windows phone apps.

Hey Everyone, With the release of wp8, and since I've always been an android guy, I decided to try windows phone.

I'm on verizon, and I picked up a used HTC Trophy, which so far has been great.

I'm just wondering what everyone recommends for some killer apps on this device?

Remember, I'm stuck on wp7.5 currently.

If this works out great, I'll definitely be buying a wp8 Device.