Same crash problem here, I can't launch iText on a PowerBook G4 running Tiger 10.4.11 with all the current updates installed:
**********
Host Name: MyPowerBook
Date/Time: 2008-04-22 17:34:18.139 +0200
OS Version: 10.4.11 (Build 8S165)
Report Version: 4
Command: iText
Path: /Applications/iText.app/Contents/MacOS/iText
Parent: WindowServer [86]
Version: 0.3 (3)
PID: 2194
Thread: 0
Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000000
Thread 0 Crashed:
0 libSystem.B.dylib 0x9012cab0 _malloc_initialize + 1016
1 libSystem.B.dylib 0x900033b8 malloc + 48
2 com.apple.Foundation 0x92bcff74 _NSAPDataCreate + 32
3 com.apple.Foundation 0x92bd00f0 NSPushAutoreleasePool + 40
4 com.apple.AppKit 0x9387d410 NSApplicationMain + 60
5 org.zackb.iText 0x0000253c start + 68
Zack Bartel iText
iPhone text message, notes management, backup utility
Version: 0.3