From Mark. Blog.: "The big buzz in the social media world lately revolves around Twitter's rollout of its "list" feature, which allows you and others to create lists of your followers: easily tagging them so you can share those lists with others. Robert Scoble thinks it's a game changer, and is pushing the value proposition for them hard. But I think lists, because they have no consent mechanism and because they can be made public, are boneheaded, broken, and ultimately make Twitter a dangerous tool to use for anyone who values their reputation." - Mark Trapp from Bookmarklet

Update: Robert Scoble responded (http://friendfeed.com/scoblei...), pointing out that you can block lists. I believe he's referring to being able to block the list creator, which does remove you from any list that they created and prevents them from adding you to a new list. It shouldn't require a block action to opt out of a list, though: I should be in control of anything attached to my profile. My two basic requirements still stand. - Mark Trapp