double--dash--domains.com any good in google?
 

for example is paris-hilton.com better than paris--hilton.com?

I think the double dashes are equivilent to single dashes as far as google in concerned.

paris------------------------------------------------------hilton

really catches the eye

From what i recall any more than 1 stop gap (space) and it is of no help whatsoever.

Google reads hyphens as a space in text so having more than one hyphen will mean that the spider will read it as a stop character / word and discontinue crawling your site.

Is parishilton.com better than paris-hilton.com , the same, or worst?

Good question, I would also like to know that.... I'd say it's worst but I'd like to hear from the Google Wizzards....

same

Good question, I'm not sure if keyword density is really counted in the URL.

it is counted.

subdomain, domain, directory names, and filename all weigh in and make a significant multiplier difference.

url keyword text is vital