The new address book in this trunk looks promising. However I'm facing a couple of cosmetic issues.
1) Some labels in the address book tabs can't be localized. For example tab contact properties: work, work2, home, home2, mobile, other and so on, keep their label in English no matter if you choose another language. These labels are missing in file program\localization\your_language\labels.inc and probably not defined in file program\steps\addressbook\func.inc as a label that can be translated.
2) Tab contact properties: the label homepage (choose add field) takes up to much space. It's truncated in front of the edit field as homepa.