I have a bunch of different Thunderbird address books set up, and I'd like an interface (I'll take something command line) that lets me search them all. Currently, if I see that something is prompting me to use an old addy in my auto complete, I have to open my contacts and search each address book separately to find the offending bad address. I'd love to search them all in one pass.
try Contact Tabs. It adds a search box to Thunderbird where you can search all adressbooks at once.