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g1smd - 11:44 pm on Aug 5, 2003 (gmt 0)
You can have extensionless URLs if the site uses content negotiation. You call www.domain.com/somename and that could be a folder or a page. The actual uploaded page MUST contain whatever extension is relevant for it, but the agent calling it does not have to specify any extension, so the site could transparently change from .html to .php without any referrers having to edit any of their pages. There is an article on this over at evolt somewhere.
I read that the extra slash is only required on the end of folder names, not when the URL is just a domain name. However, I always add the trailing slash to all URLs either at domain or folder level.