The move of update region handling to wineserver (http://www.winehq.org/hypermail/wine-cvs/2004/12/0100.html) back in December caused a regression in Hamster 2.0.0.1. After this patch, Hamster steals focus constantly. When I switch virtual desktops in KDE, it immediately switches back and reactivates the Hamster window. This is even with KDE's "Prevent focus stealing" set to Extreme. Hamster can be downloaded from http://www.tglsoft.de/misc/hamster_en.htm.
Another patch from Jan 31 (http://www.winehq.org/hypermail/wine-cvs/2005/01/0724.html) provokes the same behavior in Remedy. Switching to another desktop or minimizing the window yanks me back to it immediately.
Both apps seem to be resisting the hide message from the window manager, but I don't understand the interaction of these patches well enough.