Looks like Apple has begun to release those iOS 4.2-compatible iPhone and iPad app updates into the iTunes App Store. Or so our App Store update would have us believe.
Ally and I have caught DropBox so far. Have you been alerted to any iOS 4.2-compatible app updates in your App Store? Let us know which ones in the comments below!
(And yes, this is another sign that iOS 4.2's release could come any time now.)