I was just writing an e-mail, which is scoped as Markdown, and got an error when trying to convert something to lower case using ⌃⇧U. I discovered that ⌃⇧U is bound to "Update References" in the Markdown2Book bundle. It probably needs to be changed to something else.
--- Rob McBroom http://www.skurfer.com/ I didn't "switch" to Apple... my OS did.