Drop Box, Evernote, Kindle, Twitter, Facebook, WeatherBug,
Maps, Olive Tree Bible Program, Fandango or Flixter, Chase
Just for reference:
Drop Box - not yet available but multiple Dropbox clients are already out
Evernote - already available
Kindle - already available
Twitter - multiple Twitter clients available
Facebook - not out yet but Facebook integration is part of the People app
WeatherBug - already available
Maps - depends upon what you mean since there are numerous map apps available
Olive Tree Bible Program - available for Windows 8 but not yet RT, it also is very buggy
Fandango - not available yet but there are already equivalents
Flixter - not available yet but there are already equivalents
Chase - not available yet (banking apps are one thing that really needs to improve)