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Forum Moderators: phranque
First and foremost, be sure YOU are not infringing upon someone else's established mark. It's sad to lose a domain, but it's sadder still when you realize that ALL of your hard-fought SEO, rank, and online "brand" evaporate with it. For that reason, for high-end sites, I recommend 2 domains one to 'market' (i.e., a splash domain) and one to optimize.
If the domain is one that someone will covet -in your industry or otherwise- I'd say the odds of getting a 'cease and desist' letter are pretty high.
#2 - The site name is the domain name and is pretty generic, aren't generic terms safe?
#3 - How would I know if anyone else has trademarked it?
The answer to #3 is 'spend money' -you can do EVERYTHING and still not be protected. It's only when you have a tradmark in hand that you are modestly assured that you will not be blind-sided.
NFFC has listed a resource here, a free trademark search [webmasterworld.com].