The only question is <drum roll>

Is it whole disc encryption and/or OTFE?

http://www.truecrypt.org/

5.0a February 12, 2008

Improvements:

The memory requirements for the TrueCrypt Boot Loader have been
reduced by 18 KB (eighteen kilobytes). As a result of this improvement, the
following problem will no longer occur on most of the affected computers:
The memory requirements of the TrueCrypt Boot Loader 5.0 prevented users of
some computers from encrypting system partitions/drives (when performing
the system encryption pretest, the TrueCrypt Boot Loader displayed the
following error message: Insufficient memory for encryption).

Bug fixes:

On computers equipped with certain brands of audio cards, when
performing the system encryption pretest or when the system partition/drive
is encrypted, the sound card drivers failed to load. This will no longer
occur. (Windows Vista/XP/2003)

*Access mounted TrueCrypt volumes over a network.(Windows)*

TrueCrypt Rescue Disks created by the previous version could not be
booted on some computers. This will no longer occur. (Windows
Vista/XP/2003) Many other minor bug fixes. (Windows, Mac OS X, and
Linux)

Version 5.0 February 5, 2008

New features:

Ability to encrypt a system partition/drive (i.e. a partition/drive
where Windows is installed) with pre-boot authentication (anyone who wants
to gain access and use the system, read and write files, etc., needs to
enter the correct password each time before the system starts). For more
information, see the chapter System Encryption in the documentation.
(Windows Vista/XP/2003)

Pipelined operations increasing read/write speed by up to 100%
(Windows)

Mac OS X version

Graphical user interface for the Linux version of TrueCrypt

The TrueCrypt Volume Creation Wizard now allows creation of hidden
volumes within NTFS volumes. (Windows)

XTS mode of operation, which was designed by Phillip Rogaway in 2003
and which was recently approved as the IEEE 1619 standard for cryptographic
protection of data on block-oriented storage devices. XTS is faster and
more secure than LRW mode (for more information on XTS mode, see the
section Modes of Operation in the documentation).

Note: New volumes created by this version of TrueCrypt can be
encrypted only in XTS mode. However, volumes created by previous versions
of TrueCrypt can still be mounted using this version of TrueCrypt.

SHA-512 hash algorithm (replacing SHA-1, which is no longer available
when creating new volumes).

Note: To re-encrypt the header of an existing volume with a header
key derived using HMAC-SHA-512 (PRF), select 'Volumes' > 'Set Header Key
Derivation Algorithm'.

Improvements, bug fixes, and security enhancements:

The Linux version of TrueCrypt has been redesigned so that it will no
longer be affected by changes to the Linux kernel (kernel
upgrades/updates).
--
See Brenda's UniWorldWare
http://tinyurl.com/nm2yt