Do you remember my TonyPa Platformer Experiment?
In these days i've finally found a way to do it in a decente way: strange things in Java, x Velocity wasn't setted to 0 when jump is updating. After many runs i've set it to 0 manually and now all works well.
With Alex yesterday i've a talk about platformer genre and what we can do. He have an impressive demo with Flash+Box2d, with cooperative attempt.
Someone have suggestion about platformer: what do you want?
Games like Super Mario, Sonic, Metroid, Knytt or what else?