you do not have to, but if you want to take full advantage of the partition then i would say yes. if you just re-flashing you rom there is no need to wipe data. just wipe dalvik cache and cache.
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. cuz we love flashing things not just roms. check this thing out:[launcher apk Regina 3d]NoirSense - what's to come. - xda-developers not sure how it works yet, but i'm gonna check it out today and see if it works on mikg2.2