Apple still hasn't fixed the issue where, when you use the Terminal to tell the Finder to show all files, including invisible ones (easy to do on Windows!), *all* files dim to half-opacity, instead of just the invisible ones. Try this in icon- or column-view mode (looks as though list-view shows them normally).
Panther did not have this problem. Turning off the setting restores all files to full opacity. This is rather off-putting, from an I-want-to-be-a-geek-but-I-still-want-to-use-the-GUI standpoint--I should be allowed to know what's on my machine without having to squint to make out the icons.