If they get this through court (even though pretty much every site on earth can probably claim some form of prior-art, but it's not as though the court system operates on a sense of logic...), it could be a bit of a pain in the ass for those of you with adult and mainstream mixed content sites:
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					Originally Posted by El Reg
					
				 
				Fark.com has filed an  application to trademark "Not Safe For Work", offering the delicious possibility of mass litigation against roughly half of net content providers including, of course,  El Reg (link NSFW, natch).
 
The audacious move was spotted by  Trademork, which not unreasonably points out that it "might be a little difficult to protect and enforce this mark".
 
Well, time will tell...  
			
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 (Source: 
http://www.theregister.co.uk/2007/12/10/fark_nsfw/)