The other day I was on the WP forums and in answering some issues over there, I was steered over to to this post/plugin. Actually it's two separate plugins, but essentially they're doing the same kind of thing - redirecting links to the right place.
If you're using "pretty" permalinks, I strongly advise downloading at least the permalink redirect plugin. Scott explains it rather well, but in essence there's a flaw in the coding of permalinks that basically create two links to the same post (three if you count the old ID method - p=359720398). The plugin takes all of those factors into consideration and 301 redirects every link to the proper permalink. (I've heard that this will be making it into the core at some point.)
The other plugin mentioned in the post is enforce www preference. I used to use htaccess to accomplish this, but now I'm glad of either way because apparently there's a small cookie issue if you use password protected posts and you enter the password at a link not the one your blog URL is. (i.e. if your URL doesn't have a www and you go to the password protected page via the www link, it won't do anything when inputting a password).
Anyhow, thought I'd share this find with the other WPers here. Cheers!
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