I know this is off-topic for the development list, but you are the right audience: Thanks for all your work in making LyX such a useful program. It is certainly not perfect, but we have just finished LyX-writing a book for Chapman & Hall which is to appear June 1st (Google for the ISBN 1420065157 if you are interested). Thanks to LyX we have been able to convince the publisher to do the book full color (something that is very useful for the topic covered by the book) as we promised them to do the manuscript camera-ready.
Cheers, hinrich d8-) PS: This is not intended to be PR for the book (unlikely anyway because it is in a very specialized field), but genuine thanks for all your work!