There is running a petition for an upgrade of the SonyEricsson T68i upgrade to enable Java [1]; the T610 has it [2].
[1] http://www.petitiononline.com/8520/petition.html
[2] http://www.sonyericsson.com/ch/spg.jsp?template=PS1&R=1&B=ie&PID=10055&LM=PSM_V