"An Intro to Qt 3.0"; "Visual Development with Qt 3.0"
For a Tcl-centric view of Qt, see Wiki.
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O'Reilly has a book, and also profiles Matthias Kalle Dalheimer. Pjotr Prins lauds the book.
Boudewijn Rempt and I did a couple of pieces for SunWorld Online on PyQt, including a "Regular Expressions" column and a feature article in May 2000. We also collaborated on an introduction to Qt (note that reader Anjan Bacchu is quite right in suggesting that I should have mentioned Borland's Kylix as a high-profile example of Qt use), an argument in favor of Qt, and a review of Qt Designer for O'Reilly Network. Watch this space for news of several more articles scheduled to appear in summer 2000.
I like BeOpen's interview with Warwick Allison.
The QXt allows a single application to exploit widgets from both the Qt and Xt libraries.