I have released TruePreview 1.7. This version includes support for OS X 10.6.7 and Mail 4.5. (This update will also include the new MacBook Pros.) NOTE: Apple has removed the PPC architecture from Mail, so all TruePreview versions starting with 1.7 will be Intel-only.
Thanks again to all of you who have made a donation to support the development of TruePreview! It really is encouraging.