Please be sure to read the whole thread, the question has been asked before :-)
.004 is meant for a PDA/smartphone while the other version you asked about is meant for users who are emulatining CE for testing purposes (ie, me because I dont have a PDA right now since the x3i died). More info about emulating CE can be found here:
http://www.mozilla.org/projects/min...o_emulator.html
Feel free to submit feedback!