I found this interesting article the other day that I thought you might like. It talks about Poison words. In the jist it is the introduction to an experiment being done about words that cause search engines to flag your site as a “low trust” site. Since I didn’t get permission to post it (I was too lazy to ask). I will just give you the link so you can check it out for yourself.
http://www.seobook.com/archives/001538.shtml
I am actually very interested in how this experiment will go. I have always made sure to filter out any words I thought was words Google wouldn’t like, but it would be nice to actually have a list.
Here is my current list:
links (for outbound anchor text)
Gambling
Viagra
poker
adult
dating
singles
high rankings
note: I do realize I put these words as text on my own site. I simply don’t care. Besides maybe I’ll start ranking for Viagra 
I agree with most of these, but maybe not “high rankings.”
Or maybe they have a way of sorting the “bad sites” into a different basket in the case that someone looks for one of the offending words.
Here is one of my lists -
porn, sex, porno, teen, xxx, xx, x, hardcore, nude, naked, Gambling, Viagra, poker, adult, dating, singles, high rankings
p.s. you should consider whacking the words in an image - that way there will not be ‘poison words’ on your page
Ya really it is interesting article. I agree this article.I thought was words Google wouldn’t like, but it would be nice to actually have a list.I really enjoy reading this article.