You can now get a feed of entries you commented on or "liked." The feed is really useful to get a glimpse of what you or one of your friends have found particularly interesting lately. Check out my comments/likes feed.
You can find these feeds and comment/like stats on the right hand side of profile pages (like http://friendfeed.com/bret):
People can only see your comments/likes feed if your feed is public or if they are already subscribed to your feed.