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As you play games or use certain apps they build in data size, saving high scores, pictures, bookmarks etcetera.
If you play alot of games or games that save at checkpoints and have lots of stats then they grow pretty fast.
Try cleaning old data and using a link to SD or alltosd style data mover.
i had this problem also, after deleting everything i found out that the mymetro app had 70 MB of storage on it.
Do a search in Root Explorer for "Tombstones" delete all the files inside that file if theres a lot and also delete your dalvik....