X11 Style Copy on Select in Windows?

Is there a way to configure MS Windows to copy text to the clipboard immediately when it is selected? Or is there an add-on utility that does this? I am thinking of the X11 style where merely selecting puts the text in the clipboard and a single mouse-click pastes it.

I've never tried it, but the True X-Mouse Gizmo looks like it will do exactly what you want.

I tried the True X-Mouse Gizmo and it was cool but the lack of configuration options didn't work for me either. AutoClipX is another solution:

http://12bytes.org/software/autoclipx

It's not free, but he's only asking for $5.