Guys...
You canot TM a word... you just cant. You can register a TM meaning.
TM is something that goes with a company, I own a few TM's that are not registared.
Vista has many people who have TM'ed the meaning they use it for. Windows vista has the TM on any OS/computer software. So no other OS can name itself windows.
This does not mean that MS can sue me for creating a site spanishvista.com. As this has nothing to do with MS. They can only sue if you are using the TM to sell a computer OS or software that is named with vista.
All of you need to know a TM is an idea, not a word. The word is only the representation of your idea. You canot trademark a word for every possible useage of that word. You just registar it for the field you are currently doing business.
I could come up with a company for selling cars, and call it vistacars.com and windows has NO right to the name or site since it is not infringing the trademark in any way.
Even google would have a hard time taking googlecars.com from my if I had it and were using it as a ecomerse site and had a differant logo with nothing in common with google.com. They own google TM but they only own that so other pages canot create a search called google or replicate any of google services(gmail,gearth,adsense, etc). Some people may disagree however as it seams they dont completely understand how TM's work as google is only TM'd for their current products. Anything with google in it probably will be challenged, but they have to prove you are using it in the same way as them and hurting them by you using it.
The original reason TM came to exist was to ensure people did not get confused with brand names. Noone would confuse google.com with googlecars.com a site about cars... They cant take it from you If you are not using it as they are.