The only thing in notepad/wordpad that can be updated that would be of any use to me would be if they where to add line numbering
Gizmo - I'll send you a copy of EditPad 3.5.3 to try out -- it has line numbering (well, it has "Go to line #)) and a few other nice touches that Notepad doesn't have (like no file size limit), but it's still ultra slim. There isn't even an install - you just run it.
No color-coding, though - that's the only thing I miss about it compared to say, Dreamweaver's source view which I use sometimes also. Later versions of EditPad have it, but I've found them to be more bloated for an everyday .txt reader.