Forum Moderators: Robert Charlton & goodroi
Google wants lower case. Do not type anything in upper case inside the urls.
Google does not care about upper or lower case in URL.
Lower case is better because it will save you some mess in the future - visitors are used to lower case URLs and might want to link to URL with URL written in lower cases, when you will get either 404 (Apache) or duplicate content (IIS which is case insensitive).