Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Core KDE developer Daniel Molkentin has written a book about Trolltech's cross-platform application development toolkit. Published by NoStarch Press, and entitled, "The Book of Qt 4," the work aims to help novice and advanced users write user-friendly Qt applications.
Qt is a mature C++ application development framework designed to let software engineers compile native-looking Linux, Mac, and Windows binaries from a single source code tree. Some of the better-known applications based on Qt include Skype, Google Earth, and Adobe Photoshop Elements. Additionally, Motorola uses an embedded version of Qt -- Qtopia Core (formerly "Qt/Embedded") -- in its Linux-based mobile phones. Qt and Qt/embedded were released under the GPL in 2000.
Qt also underpins KDE.