I have seen countless posts about "Download Minecraft FREE!!!" and I want to take some time and say why it's wrong.
1. Illegal - Downloading Minecraft for free from ANYONE is illegal and can get you fined/charges held against you. If you bought Minecraft, you can see that when you login, there is a Mojang AB notification that says "Mojang AB Copyright, do not distribute."
2. Will be fixed - A post on twitter states that Notch will stop websites that do this soon.
3. Hacking - aTo get the free Minecraft, you download it but with a hacked .jar file. This is also illegal do make, give away, or even worse, sell.
4. Virus - You will also get an unwanted virus with the file that may send your username and password and e-mail to the maker and they can put it on the web for everyone to see.
In conlusion, never EVER download a supposed "Free" version of Minecraft. Thank you for your time and enjoy Minecraft the way it was intended, by buying the game.