While I wouldn't use it much, I'd quite like to have a KHTML-based browser for Windows. Especially now that the Safari and Konqueror developers have come up with code that passes the Acid2 test. A KHTML-based broswer for Windows (native, not GTK) would be great for web developers wanting to test their sites on all three of the major rendering engines (the others being Mozilla Gecko and Opera).
Now, if only Microsoft would come to the party with standards support... There's still time (but not much).