I use Mutt for email, and recently hacked a small shell script to create a distribution
list containing all the addresses in an .alias file. You can download it here.

Have also recently written a short python script to convert an export Gmail contacts vCard file to abook format. It's still very basic (only treats name, email, phone and nicknames), but I hope to improve on it when I find the time.

I am an experienced Java developer currently working for Tata Consultancy Services in Geneva.
You can view my CV here.