lucy24 - 11:43 pm on Nov 20, 2012 (gmt 0)

CheckSpelling On

Funny you should say that, because I took a big detour into mod_speling and then discovered I haven't got it installed (I used to but they seem to have removed it) and didn't want to say anything without personal testing.

Apache docs do say that mod_speling uses a redirect, so you don't have the Duplicate Content problem. An even safer option is to say

CheckCaseOnly On

so you don't have to worry about what happens when you've got a sensitive file named imdex.html.

I get taken to domain/wp/

This is probably OK so long as your address bar changes. So it's an explicit redirect rather than a rewrite.