Requiring trailing slash at end of URL

[eluser]jplanet[/eluser]
Thanks for these responses...there is something specific about this though that might require something different, or perhaps just a variation on what has been suggested...

As part of the SEO plan for this website, I need to migrate URL's gradually. To do this, I have created directories on the old site (which was actually done in Cold Fusion on a Windows server). These directories correspond to the new CI site's URL's. For example,

www.example.com/gallery/

Contains an index.cfm file which shows the contents of what was once:

www.example/com/index.cfm?fuseaction=gallery

Now, the URL directly above, containing the query string, has a 301 redirect to the new /gallery/ url. Te idea is that search engines will have indexed the new URL's a few at a time before the domain is transferred to the new CI site.

What the suggestions above do not address is, CI URL's always work with or without the slash at the end. For this very page we are reading now, http://ellislab.com/forums/viewthread/67843/, also works as http://ellislab.com/forums/viewthread/67843. This is a problem in SEO...I would have to find a way to force http://ellislab.com/forums/viewthread/67843 to 301 redirect to http://ellislab.com/forums/viewthread/67843/.