The IE8 tabs will not be skinned, but thats normal for IE8.
Are there plans to make the tabs and toolbars skinnable for IE8?
FYI, I'm using the beta on Vista and have no issues at all. 
Edit: I spoke too soon. The IE Tab Close Button is not skinning. Here is my info:
Your computer has a Windows Experience Index base score of 4
Your Windows Graphics Experience score is 4
WindowBlinds version : WindowBlinds 7.0 (build 170 x86 - Vista Edition)
WindowBlinds is installed correctly on this PC
WindowBlinds appears to be activated on this PC
(HP w1907 Wide LCD Monitor) 1 is attached to NVIDIA GeForce 8400
Wblind.dll 2009/06/04 15:30:20
Wbsrv.dll 2009/06/04 15:31:19
Wbconfig.exe 2009/06/04 15:49:02
Wbload.exe 2009/06/02 14:39:14
Wbhelp.dll 2008/07/20 19:35:07
Tray.dll 2008/07/20 19:35:21
Wbload.dll 2009/03/17 09:36:28
Screen.exe 2009/06/04 12:48:09