For the record, since I can't update my post...EVERYTHING that is removed with this is either obtainable through the stock apps collection I listed in the main thread, metro app store, or the google market.
These are all safe to remove, they just modify what you can/can't do with the phone.
Obviously taking off maps will remove navigation, as well as places, and Latitude, as they're part of the maps app installation procedure.
When I say they're safe, I mean that they in no way shape or form prohibit the use of cellular communications, sms, mms, voicemail, voice calls, 4g, 4glte, 2g, or 3g communications.
They remove miscellaneous features from the phone that certain users may find "undesireable."