Book lust.  

1601 decorating ideas for modern living
A practical guide to home furnishing and interior design, (Hardcover)
Gerd Hatje and Peter Kaspar
This is my absolute favorite modern interior book.
I find something new every time I look. This book was recommended to me when I first started collecting.
Every photo is modern and the book is very affordable
http://www.amazon.com/1601-decorating-ideas-modern-living/dp/0810901293/...

Domus series by Taschen....
I just picked up vol.3, vol.4 and vol.5 of the
Domus 1929-1999 set. I find it quite informative as it presents a very international viewpoint of the mid century movement.
http://www.amazon.com/Domus-5-1960-1964-Stefano-Casciani/dp/3836509555/r...

great choice of topic ite
Arts & Architecture is at the top of my wish list. Not exactly affordable, but seems to offer good value for money compared to many other design books.
Domus is great too. I have borrowed the volumes one by one from my local library. I wouldn't necessarily buy the whole set, as the 1950s and 60s collections go a long way. They do look good together though. Probably the best designed backs of all the Taschen collections.
I am also looking at Julius Shulman: Modernism Rediscovered (pic below). Anyone have this?
http://www.amazon.co.uk/gp/product/3822842877/ref=s9_wishf_gw_t?ie=UTF8&...

Modernism Rediscovered
I have the single book edition of this and recommend it highly to any MCM fan - well worth the price for the pictures alone...

Thanks J.J.
Very good to know.

Thank you all for the...
Thank you all for the suggestions, it turned out to be one lovely beast of read :o) - not sure if that's proper English.

Inside Today's Home...
by Ray and Sarah Faulkner, published in 1960. Gives you the whys and wherefores of mid-century living.