There's a new user history interface, at http://www.metafilter.com/activity/(your user ID). It's linked on user pages now and provides a consistent view of your posts, comments, and things favorited by others (including a new most popular favorited list from your history). Three cheers for pb for building it, it should be much easier to use and more consistent than the previous way we did things.
NewFeatureFilter: Ask MetaFilter search, and all user pages have Ask MetaFilter history, with Ask MeFi removed from MetaTalk history. This is the tip of the iceberg, several major features will be added this week.