I've mentioned this problem before with Vista 64, but with Windows 7 it is really bad. Basically, when I close a program, the icon disappears, but the space it occupies remaines and the title remains while providing no function when clicked.
For vista, I only found one program, Thunderbird. With Windows 7, it seems like any program operating system related as well as others, such as calulator, excel, and using the recycle bin. I know this program does not support Windows 7, but this should help future development for it.
I hope the programmers can fix this, otherwise, I'll have to move to another solution.