2004.01.20 18:40 "[Tiff] Reading Custom Tags", by David Christopher Asher
2004.01.23 22:14 "RE: [Tiff] Reading Custom Tags", by Pushkar Pradhan
If you are reading/writing lot of geotiffs, then you may want to use GDAL (http://www.remotesensing.org/gdal).
This library reads geotiffs and many other remote sensing format images.
Pushkar