The last days, I 've read the book "apache sold beginners Guide". The book starts with knowledge for beginners and describes how to install Solr on windows, linux and mac. With lots of examples, you can understand the operation of Solr. Another big part of the book is dealing with searching function. The book tells you also about extending search, faceted search and distributed search. The book is a very good partner for starting with Solr. It's extremely readable and I can thoroughly recommend this book.