Free ChangeTextCase Revit Add-in from dp Stuff

"This add-in allows you to alter the CASE of Revit TextNote elements. You will have an ability to chose between UPPERcase, lowerCase, TitleCase, and SentenceCase. Apart from that you would be able to chose whether you want to alter selected text notes only or all visible text notes in the active view."

This free add-in may be downloaded from the dp Stuff website.