I don’t use FriendFeed much (yet), so I’m not as interested in these features. One feature that’s really interesting to me is the new network health information provided in the bottom right hand corner (see red arrow). This monitor has been improved to provide more information including the number of requests made in the last hour. Coupled with twhirl’s new ability to automatically adjust it’s Twitter API usage, you shouldn’t have any more problems with twhirl not working because of heavy usage.
If you’re interested in a stand-alone Twitter client and haven’t tried twhirl yet, I highly recommend it. It has completely changed the way I use the service.