Eight hyphens to be exact. A thread at SEO Chat named Finally, the secret to Google rankings revealed refers to a domain name that has eight hyphens in it and nine keywords.
Normally I would not point out a site like that, but I have not seen one that long publicly mentioned in a while. I find it interesting that the domain name doesn't somewhat match the title of the page (Nikko Megatech Remote Radio Control Vehicles) nor is the heading of the page using an H1 tag - it's using a graphic that looks like text. I am sure there are other things but that is all the time I got. It does rank well, so it obviously has a few links.
Sorry if this is a "spam report" but I just appreciate the domain name so much, I had to share.