Being case insensative is handy, but it does make the [[BackLinks]] and [[blog]] links a bit ugly compared to other links. It should be possible to support pagenames that have uppercase, while still allowing them to be linked to using any case. Also, newly created pagenames that include upper case characters should perhaps not automatically be converted to lower case then. Also, it's currently possible to check in a filename with uppercase and ikiwiki will render it that way, but fail to edit it online and probably in other ways.