P2P programs like limewire, imesh and so on....but make sure you are VERY careful not to download a virus. If you have a good AntiVirus program you will be fine
Torrents are very good i agree Threepwood but......like quoted here ^^^ they can be very slow and its not a instant start download....you have to wait for people seeding to connect and so on....where as limewire is good as you have an instant start...and i mainly use torrents for programs that are of a large size...
5) Keep Things Legal
Any discussion, links, or information on hacking, cracking, serial numbers, pirating, warez, or any other illegal matters is not allowed.