Some time back, there was a promotion (Germany) that allows us to get 6 months free of BitDefender Total Security 2010,
It was 'shared' with us by Raymond here:

http://www.raymond.cc/blog/archives/2009/01/08/free-210-days-bitdefender-total-security-2009-genuine-license-key/

The process involved using Germany proxy but it was found out that all those who registered received the same common serial key.

Good news is that I found out that the key can be used for the latest version 2010.

Quoted from: http://forum.bitdefender.com/index.php?showtopic=14238

So now, let's get to serious business.
Here are the procedures to get BitDefender Total Security 2010 free for 6 months :

1. Download BitDefender Total Security 2010 and install.
2. Register the product with the folllowing 'universal' license key:

BB7798E9A1E6E5B1E044

3. That's it. Enjoy BitDefender Total Security 2010 6 months free.

(You can also get 7 months free. Simply download and install the trial version of BitDefender 2010. Use it until the 30 days trial expires before using the above 6 months license key.)

You can download the installer files using the following links:

http://download.bitdefender.com/windows/desktop/total_security/final/en/bitdefender_totalsecurity_2010_32b.exe (32bit)

http://download.bitdefender.com/windows/desktop/total_security/final/en/x64/bitdefender_totalsecurity_2010_64b.exe (64bit)

Enjoy.