Taken on 10.5.5 (same effect in 10.5.4) :-(

<rant>
Ok it’s enough the Leopard stacks “feature” is imho totally useless if you have moren then 20 items in a folder. If you use Safari Stand + the “Tidy by Date for File Downloads”-Option (highly recommended) the two views aren’t helping in any way.

I want the OSX Tiger Dock functionality back !
</rant>

Activate Spaces press “c” to collect all open Windows on the first workspace.