[eluser]Pygon[/eluser]
Trailing slash does matter:
Consider APACHE's MultiViews which will result in:
site.com/foo/bar
which can be:
site.com/foo/bar.html
site.com/foo/bar.php
site.com/foo/bar/index.html
site.com/foo/bar/index.php
etc.. etc....
So yeah, it can matter.
Throw on google analytics for example, and you'll note that links to "foo/bar" is tracked differently than "foo/bar/".
Anyway... my recommendation would be to use a trailing slash in your urls (since someone typing in without a trailing slash will still get the same page from CI