A few useful links about trademarks

A trade mark is a word, phrase or symbol, or a combination of words, phrases, symbols or figurative elements, that identifies and distinguishes the goods or services of one company from those of another. Organisations ranging from SMEs to huge multinationals use trade marks registration systems to protect their brands.
 
These is a first list of interesting links about trademarks

USPTO Bulk Downloads: Trademarks - Google repository for US TM raw data 

http://www.google.com/googlebooks/uspto-trademarks.html

OECD Working paper about trademarks as an indicator of product and marketing innovations

http://www.oecd.org/sti/innovationinsciencetechnologyandindustry/42534274.pdf

EU TM office search page:

http://www.tmview.europa.eu/tmview/welcome.html

MARKIFY: alternative TM search engine for EU

http://trademark.markify.com/trademarks/ctm/ariminolva/001999580