You know what would be nice? The ability to DM to a list. Say I make a list of people called SoapMakers, and I find a great soap making resource. I'd like to be able to enter the list name SoapMakers in the 'To' field, and this link would be DM'd to anyone on my SoapMakers list that I'm subscribed to.
FriendFeed is one feature short of being perfect for me. That feature is being able to split one's feed into several, so that people can subscribe to just the part of my activity they're interested in. I'd have one with only high-quality, serious stuff, and one with everything.
The constant jumping down of the feeds/posts in real-time on the beta is annoying (me and a lot of others it appears). If you are mid-page down, why not make the page static (i.e. stop the screen moving when new posts come in at the top but have it scroll down)?