Warning: This post will be french focused! 
Following the launch today of a web site providing real time traffic information ( V-Traffic ) I’ve just played a little bit with J2memap and added the ability to overlay these traffic informations.
Seens nice at a first view, but not very accurate in my own town (Bordeaux), while Paris seems to be fine.
V-Traffic offers already a mobile version, but in wap. With this version, you will have all the features of J2memap: ability to be postionned through a GPS, usage of other maps (Google/MSN, Yahoo,Ask.com) ,
satellite mode, etc….
Note: this is an experimental version…If you are interested contact me.