Actually, most key words are trademarked in some part of the world so you don't really know if you are stepping on a hot stone.
Check out
http://www.wipo.org.uk (Garry Anderson) for a one person view on why tms are a joke and why on the internet, ICANN should establish a .tm for companies with trademarks.
Best thing always :-
1. Get your own tm if you can on that name.
2. Show good faith by developing that domain into a meaningful business
3. Have good lawyers on standby to advise you how to further protect your name if you can't get 1
This industry is full of speculators who are just hoarding names for resale. Possible 90%+ of all names have been hoarded with this in mind. Most speculators have too many great names and too little resources to seriously do 1, 2 and 3.
Given the situation, I believe that businesses will become increasingly familiar with reverse cyberjacking prompted by lawyers who are hospital chases and C & Ds will become a norm.
Bottom line, get ready to fight.