security - Looking for a USB Thumbdrive / Flash drive encryption solution (not TrueCrypt)

I am looking for a USB Thumbdrive / Flash drive encryption solution. I have searched the net but I have never come accross a solution which meets the following:

1. Must handle at least 4GB volume


2. If possible, fully portable (no install required required)


3. Does not require admin rights in order to access/write encrypted files on the flash drive


4. Does not corrupt data should the flash drive is removed from a USB port and the data is in a 'unencrypted' status


5. Data is automatically encrypted if the flash drive is removed from a USB port and the data is in a 'unencrypted' status


6. Portable apps must be able to run from the 'unencrypted' volume (in non-admin mode)

PLEASE do not mention TrueCrypt as I am not considering (especially for wish list #3)

Many thanks!

Update 5th October 2009: Still unresolved.