What is a RSA Security Token?
A RSA Security Token is a piece of hardware issued by PokerStars, in addition to your password. Once a RSA Security Token is enabled for your account, you will be required to enter your RSA Security Passcode every time you login.
The RSA Security Passcode is a combination of two elements:
1. Your four-digit RSA Security PIN followed by
2. The six-digits currently displayed on the window of your RSA Security Token.
Note that the RSA Security PIN is not related to your PokerStars PIN.
The use of the RSA Security Token enhances account security by providing two-factor authentication, requiring you to have ‘something you know’ (your PokerStars password and RSA Security PIN) and ‘something you have’ (your RSA Security Token).
This feature is a strong defense against keyloggers and unauthorized people accessing your account.
What do you think about that?
It's not for free as you have to pay 6,000 FPP for that ($60-$96 depending on your VIP status), but it's definetely worth that money if you're regular here and you are going to stay here in the future.
Your opinions?

More info: http://www.pokerstars.com/poker/room/features/security/token/