Okay...so, I know on previous firmwares, to change the text tone, you packaged your sounds in a UISounds folder into a package for Winterboard, with filenames of sms-received1-6.caf. Here's a question for you. The new ones in 4.2.1 are named--i.e. Update.caf, or Spell.caf. If I follow the same procedure and rename the files to those, it does not work in winterboard. I haven't tried replacing the files themselves yet. Anyone having any luck here? This opens up possibilities of big SMS theme packages...