2008.07.02 17:27 "[Tiff] BigTiff Support", by alexander johnson
Thread
2008.07.02 18:07 "Re: [Tiff] BigTiff Support", by Edward Lam
As far as I am aware, all of the spec has been implemented. The library is currently in beta for a reason.
Note that http://www.remotesensing.org/libtiff/ still says that it is in alpha release. Someone might want to update it with the most recent info. :)
-Edward