http://www.teamtekin.com/ - Great products for your racing or bashing needs.
http://www.teamassociated.com/ - World champions enough said.
https://traxxas.com/ - One of the biggest names in RC.
http://www.prolineracing.com/ - One of the very best at what they do.
http://hitecrcd.com/ - Electronic componants is what they do and do it well.
http://www.sa.com/voxusa - Great servos and growning into other areas of the hobby too.
http://www.jconcepts.net/ - Quality parts and designs providing great sponsorships to the hobby.
http://www.reedypower.com/ - Long time proven winners
http://www.castlecreations.com/ - Great combo kits - Home of the Mamba.
http://www.raceaka.com/ - Really great tires to be sure.
http://www.protekrc.com/ - A long time electronics manufacturer, you can't go wrong here.
http://www.hobbywing.com/index.asp - Provides great products and a real bang for your buck.
http://www.partsrc.com/ - A great RC site with helpful blogs, reviews and information.
http://rcdriver.com/ - Great articles for the RC enthusiast, with information and reviews.