I can't seem to find details on how to unsubscribe from ubiquity commands. The command list page only seems to have information about the installed commands and there are no links to deleting them. Am I missing something?
Go to about:ubiquity in Firefox. Under the section "subscribed feeds" there should be an option to unsubscribe to command feeds you no longer desire.
Also, if you clear your entire browser history, it will delete all command feeds (this will be fixed by 0.2)