Maximum Fit Magazine

Hi, I've been thinking about xp curves in the sense that in a lot of games, some character levels need too much xp and boredom or a sense of stagnation takes over. I've tried to come up with an ideal curve or even with a theory on how to create the ideal xp curve, I am came up with nada. Do you have deep thoughts, or _link_s to deep thoughts with regards to xp curves ? PS : Yes, I know some of you feel experience points are outdated or even a bad mechanism, just ignore this thread in that case. I am sold on xp ;]