Tor is a experimental tool to anonymize several internet connection. Using Tor in a K/Ubuntu system is too easy.
Install tor and privoxy with
apt-get install tor privoxy
Tor and Privoxy package open a socks 5 port on localhost:9050 and a http proxy on localhost:8118
Note if you using a not crypted protocol, automatically tor encrypt the data packets in the connection from you to the last “Tor Server”.
You can use tor with several protocols:
HTTP) You can use tor with konqueror, firefox or other browser setting localhost and 8118 as your proxy server.
IRC) Konversation and Kopete actually don’t support Socks connection. Then in Kde you can use KVirc.
You can Set up kvirc for access to freenode network in this way:
1) Edit /etc/tor/torrc and append the line to the end of the file, mapaddress 10.40.40.40 mejokbp2brhw4omd.onion
2) Restart the Tor service: sudo /etc/init.d/tor restart
3) Open KVirc
4) Click Settings>Configure KVirc>Connection >Proxy Hosts
5) Click “New Proxy icons”
6) Edit configuration fields:
proxy: tor
port: 9050
host: 127.0.0.1
Protocol: Socks v5
(the other fields are empty!)
7) Click Settings>Configure Server.. 
Add a new server
server: Frenode Torified
9)Click “Advanced…” button
10)Set you identity
11)Insert in “Connection” tab:
port: 6667
IP Address: 10.40.40.40
Choose Proxy Server: "tor:9050"
12) Press Connect!:)
