Layered windows required to support Clippy properly?

[Dan Kegel]

I see in wine-1.1.5's announcement that we now have
partial support for "Layered Windows",
http://msdn.microsoft.com/en-us/library/ms997507.aspx
Which apps use this?

Seems that it used to make screen captures hard,
so one way to find them is to look for apps that
say you have to turn on "Capture Alpha-Blending" on in UltraVNC
to see them remotely.  Candidates include:
Visual Studio - tooltips
Microsoft Office - Clippy
Possibly photoshop cs3

Another way is to look for apps that recommend the
Vista Layered Windows Performance hotfix or Vista SP1.
Candidates include:
Yahoo Messenger for Windows Vista

Another way is to look for apps that make Wine output
fixme:xrender:X11DRV_AlphaBlend Ignoring SourceConstantAlpha ...
Candidates include:
Miranda IM http://bugs.winehq.org/show_bug.cgi?id=11902
MSN Messenger http://bugs.winehq.org/show_bug.cgi?id=8555
Skype http://bugs.winehq.org/show_bug.cgi?id=12334

I'm getting the feeling it's widespread.  Anyone else
know of examples of apps that Wine displays poorly
because of the lack of this feature?
- Dan