(Ryan Rempel rgrempel@gmail.com): I'm starting a new intranet-style wiki, and I'd like to make the wiki links fully case-insensitive.
You should be able to get away with only changing a few things in Title.php, to make the DB form, display form, and URL form all case folded. It should still be OK to put both cases in the link itself, as long as Title.php folds in before lookup and when creating links.
How this reacts with changes that may have been made since I had my hands in the code, I make no promises...