To unsubscribe from an user with account on another Laconica server go to your subscriptions page, right click on the user's avatar and choose "Copy Image Location". Then paste the URL below:
Security info: You won't have to provide this page with your password. After clicking "Unsubscribe from the user" button you will be redirected to Twit Army server and you will provide it with your password directly.
This script is entirely client-side. No data is ever send back to the GizWizSearch server. You can choose "show source" option in your browser to review the code.
Disclaimer: This script is a quick dirty hack and don't really check user input for errors. Laconica API is also new and pretty untested (I suspect). There may be side effects, including wiping out all your subscriptions and severe diarrhea. That's not very probable, but remember this page is provided "as is" and without any warranty. Besides, I live in East Europe, so don't even try to sue me. You can post problems, questions and suggestions to my Twit Army account.