CN is definitely out since direct messaging no longer  works therein.


 TW Blue is a good alternative, although there are some quirks with it. First, If you send a direct message and manually enter the recipient's Twitter name, then tab to the text field, TW Blue thinks you're replying to  whatever message happens to be in focus in its internal list, but the message does in fact go to its intended recipient. Second, If you have never activated a Twitter account using TW Blue, you must use what's called a snapshot build, which you can get from the TW Blue Website, http://www.twblue.es. Snapshot builds have some extra code in them that uses Twitter's old way of authorizing a new application. TW Blue does have a keymap for Chicken Nugget. It isn't perfect, but once one gets used to it, it does do what it's supposed to.