Bitmask is an open source application to provide easy and secure encrypted communication. You can choose among several different service providers or start your own. Currently, Bitmask supports encrypted internet (VPN) with encrypted email coming soon
Skype tunnel works in very similar way as well-known "TCP Tunnel/Monitor"... with only one diff: the transport for it - Skype Network.
wlan als "untrusted" markieren -> ssh-tunnel benutzen, soll gg firesheep helfen
Miredo is an open-source implementation of the Teredo: Tunneling IPv6 over UDP through NATs Internet proposed standard (RFC 4380), targetting the Linux kernel and BSD operating systems. The purpose of Teredo IPv6 tunneling is to provide IPv6 connectivity to users behind NAT devices, such as most broadband routers, most of which do not support IPv6.