Fast and secure address book

Hi,

I know Thunderbird has an address book but it's buried in the email client and not easely accessible. I have portable apps on a thumb drive : What happens if I loose it. My Address book is not even lightly protected in there.
Could you guys separate the address book, or build an fast to use and easy to secure address book ?
Maybe scramble the content with encryption even...

Thanks for a great concept.
Someone showed this to me and it totally fits my work style !
No more lapetop and cables to carry ! My back and camera say : Thanks!