A couple discussions in the tb-planning group about changing the name of the trunk (nightly) builds of Thunderbird to something other than Shredder. Firefox made this move earlier going from Minefield to Nightly. Further, the use of the name of Aurora can only be used for Firefox and therefore they are looking for a new name for the first Thunderbird Alpha builds. Some of the suggestions have included Athena or Apollo.
Shredder, the current code name for the Thunderbird Trunk (nightly) builds could be going away to be replaced with something that would attract more users and would be softer.