We did talked about the new notepad which is coming in Windows 7 but its still time unless it is rolled out and moreover you will need Windows 7 to get it. But somebody at Deivneart has cracked open the Notepad 2008 in windows 7 and now you can download and use it in Windows vista. Moreover if you be interested check out the customization being down by Solodev here and here

Download Notepad 2008 ( Link )