Markwatch
Markwatch will monitors the Internet for you looking for trademark infringements.

PATSCAN Patent Trademark Search University of British Columbia
A prfessional trademark search will be made using the Canadian, US, or International patent classification systems, plus any relevant technical terms.

Thomson & Thomson Professional Trademark Search
SAEGISTM, the only online trademark search and research service designed to harness the power, flexibility and intuitiveness of the World Wide Web. Some services free or pay for for a professional trademark search.

Woolcott And Company Trademark Search
Since 1961, Woolcott & Co. has specialized in patent, trademark and literature searching, as well as technical translations. They offer a lot of online search services in all IP areas in 24 hours.

Patent and Trademark Drawings @