There are quite some good general books on linguistics that are very interesting for both lay people and linguists who are not specialised on those topics. The Unfolding of Language is a very compelling book about language evolution in general.
The Horse, The Wheel And Language by David Anthony is a wonderful book to understand how Indo-European languages might have originated.Terrence Deacon's The Symbolic Species is already and old but still intellectually stimulating book on the very origins of human language within the realms of humans' evolution.
Stanislas Dehaene's book The Number Sense: How the Mind Creates Mathematics is more on mathematics and the brain but it touches language for number processing.If you really want to get a glimpse into language and brain processing, you can go to Eric Kandel's Principles of Neural Science and read the chapters on language and learning - but that book is a general introduction and probably contains more than what most non-neurologists would like to know about the topic.
|General suggestions||Lomb's How I learn languages||This is one of Kathó Lomb's book about how to master several languages|
|Chinese||Growing up with Chinese||This is for beginners|
|Chinese||Le Chinois de tous les jours||Also for beginners, it is just a good phrasebook with real phrases. It has the Chinese sentence, pinyin and French translation. You can download the audio|
|German||Radio Wissen||Public online radio about cultural and scientific things|
|Norwegian||Norwegian-English Dictionary: A Pronouncing and Translating Dictionary of Modern Norwegian (Bokmal and Nynorsk) (ISBN 978-0299038748)||Probably the best Norwegian-English dictionary, somewhat outdated|
|Norwegian||Norwegian Practical Dictionary (ISBN 978-0781811064)||There are few decent English-Norwegian dictionaries out there. This one is both ways and although there are some words I have missed, it is fairly decent and has quite some information on collocations.|
|Russian||Dictionary of Advanced Russian Usage: A Guide to Idiom, Colloquialisms, Slang and More (ISBN 978-0884003502)||Lots and lots of concrete translation examples for expressions you do not find even in the Oxford Russian dictionary|
|Russian||Oxford Russian Dictionary (ISBN 978-0198614203)||There are very few decent Russian dictionaries out there and this is the best I have been able to come up with for the English-Russian pair|
|Russian||Novaja Gazeta||This is a fairly known Russian newspaper, good when comprehension levels are already high|
|Russian||Snob||You can find interesting stuff about culture, science in general|