jibjib is a small, fast and easy J2ME Twitter client for any Java-enabled mobile phone with CLDC 1.0/MIDP 1.0 for version prior to 1.0.11 and CLDC 1.1/MIDP 2.0 for version 1.0.11 and later. jibjib is minimalistic and it is designed for road warriors.

http://code.google.com/p/jibjib/