The problem-plagued iPhone 4 isn't out of the woods yet.
Aikhabara News are reporting that one of their assistants noticed a ghostly "Q" in the upper left corner of her phone's screen — apparently the result of typing an email. The rogue letter didn't respond to finger input, but disappeared after the phone was reset. FWIW, this was a stock, un-jailbroken i4 running iOS 4, not 4.01.
Messages to Jean-Luc Picard's galactic nemesis went unanswered.