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IMS Google changed how it handles such things oh about the fall of 2004.
However I am a very old bear, as bears go, so maybe I've missed a thing or so.
[edited by: tedster at 11:05 pm (utc) on Nov. 30, 2006]
[edit reason] make the link direct [/edit]
They certainly used to have such a system, back in 2002 and 2003, and maybe into 2004, but I don't think that same system works now.
Recent advice seems to be to 301 redirect to a URL that ends with a trailing "/" directly after the domain or folder name.
If you mean in the next 50 years, I'd bet that is right.
If you mean within the next two years, there is no evidence to support that. Sometimes they get it right, but they often get it wrong. It's senseless to not canonicalize all this yourself. Content should only be displayed on one URL.