A short walk from Oxford Circus tube station, Kaffeine is easily one of the best coffee houses in London. Whenever I'm working in the area I pop in beforehand to kick start my day with a well-made cappuccino.
The best magazine store in London! MagCulture stocks around 600 independent magazines from all over the world. They always have the latest issue of everything and you will ALWAYS find something you've never heard of before. Make sure you visit on PAY-DAY, as there is a good chance you'll walk away with a delicious new publication.
The many book stores dotted along this strip can provide hours of inspiration. Aside from those selling new books, several specialise in second-hand and antiquarian books.