There are two mobile versions of TwitKu:

iPhone/iPod Touch: http://i.TwitKu.com or http://TwitKu.com/i

Standard mobile version: http://m.TwitKu.com or http://TwitKu.com/m

Note that you may want to get your Jaiku API key on a PC at http://api.jaiku.com/key and write it down because many mobile browsers can't handle that page properly.