We just launched contacts activity (looks like this, also on the sidebar of the front page showing the most recent 10 things). More explanation inside. [more inside]
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.