To at least give you all some relief from Lion's version of Mail, I have released an incomplete alpha version, TruePreview 1.8a1. This version includes preliminary support for OS X 10.7 and Mail 5.0. Due to changes in Apple's code, the reply, forward, and scroll/click options are unimplemented and disabled in this version. I will (hopefully) add them back when I figure out how to make them work. So, this version only contains the delay (immediate, never, X seconds) and "Viewing in a separate window" functionality. NOTE: This version is only for Lion and Mail 5.0. If you have an older version, please continue to use version 1.7.
I very much appreciate all of you who have contacted me with words of support and encouragement. I am also extremely thankful for all of you who have made a donation to support the development of TruePreview! It has spurred my on through my frustration of trying to get this working!