*Mesh WiFi with autoconfigure and routing - not yet available
*Amateur radio voice and data apps which can be used on commercial radios - some can be implimented with chroot debian
*TOR, already well implemented
*Encryption, make it dead easy like cut/paste - still needs to be easier
*Obfuscation, use stenography to hide encrypted confidential information or even applications where they will not be found in quick searches - a few apps hide the buttons but nothing easy and really secure
*Smart sneakernet, if the Internet is down use WiFi or Bluetooth to help a person physically traveling from one mesh to another intelligently deliver mail or info reminiscent of Fidonet - still a cool dream beyond beaming files over bluetooth or mass storage with H-E-N
*Embedding data into pirate FM radio streams to be read by smartphones - this would still be super cool but dont know how many stations would embed info
*Whole device encryption or panic button wipe if there is a possibility the device may be confiscated by police or paramilitary troops. - again super cool as long as it has a good safety and danger mode switch
*VPN, well implimented but requires a server elsewhere in the world and internet access
*picture and video sharing - well implemented but ssh/ftp uploading to private servers would be useful