standalone, downloadable etc

Python for S60s & S40 symbian editions, mostly Nokia, Samsung

Java for mostly Sony Ericssons, Android (but own version of Java) - Android also being adopted by Motorola 

Mobile linux - have heard of Samsung, Motorola - not sure about others yet

Blackberry uses J2ME but interesting Jython project - currently in alpha has possibilities for using Python with Java allowing options for creating apps for Blackberries with Python.

Out of scope for mobsessed project - iPhone