Edit: the official version on Curse has been updated by the author for 4.1 as of 5/4/11.
Who loves Mik Scrolling Battle Text? Me me me! But the last update was 6 months ago.
There is a FAN UPDATE for 4.1 on Wow Interface. It works like a dream. I test drove it last night with no complications. All my old settings were still there.
So go get it!
Yes, I recycled some old screenshots. Sue me.