Posted: 21st Jul 2007 19:27
@Sasuke:
Apparently Dx9.0L will be a faster version of the current DX9, but for vista only. Heres where I read it:

http://www.theinquirer.net/default.aspx?article=35140
Posted: 21st Jul 2007 20:44
Sorry, your right, DX9.0L is a faster version of DX9.0c and adds support for shader mark 4.0, and as you said is only for Vista. October DX9.0c is the last release for XP.
Posted: 22nd Jul 2007 20:29
Actually the latest 9.0c update was this July, unless you mean it's ending in October this year.