Miheer, I am not against trademark protection, but the cases of companies trying to, as I said, cordon off normal language are increasing.
Facebook has been filing trademarks on a variety of words from
wall to
poke to
like and what not. Now, trademark law is complex, and I do not claim to know it or consider myself able to make individual judgments, but it's easy to see that lines are slowly being crossed in the name of trademarks. It's mostly corporate heavy-handedness.
Here is a nice article:
http://www.nytimes.com/2011/03/27/weekinreview/27zimmer.html?_r=2