Internet Duct Tape has a great Greasemonkey script which will effectively turn FriendFeed into a Twitter client; adds the ability to tweet directly from FriendFeed, complete with a 140-character counter to keep you within Twitter parameters.
Still “client” is a bit misleading… to be able to see the messages of everyone you follow on Twitter, you would still need to follow them on FriendFeed (if they’re there) or add them as imaginary friends… which as I said before, is actually a really sweet feature. The same source also has a downloadable script to do just that; if you are on windows.
