Crossover is a pretty decent way to run some Windows programs on an Intel Mac -- without the need to install or own Windows. It uses Wine as its backbone, and "needs" a file called quartz-wm off of your OS X install disc to make it look and feel more integrated into OS X. I put "needs" in quotes, because you -can- run it without the file, but it will look and feel rather clumsy.
So what to do when you don't have your OS X disc handy, but want the integrated feel? Quartz-wm is a window manager that Apple bundles in their distribution of X11. So the logical thing to do would be to install X11. Well, I tried downloading X11 from Apple's site, but that simply wasn't working. The 'old' version basically said it wouldn't run, and the 'new' upgrade said that I didn't need to upgrade.
Fortunately, quartz-wm can be extracted from the installer, and dropped into the Crossover application. I started by downloading the X11 Update 2006 1.1.3 from Apple. Control-click that file, and choose Show Package Contents from the pop-up menu. Once inside, you'll want to double-click Archive.pax.gz to extract the archive onto your Desktop. Open the resulting folder on your desktop, and navigate to Archive -> usr -> X11R6 -> bin. In another Finder window, control-click on your Crossover application, and go to Show Package Contents. Navigate to Contents -> SharedSupport -> X11 -> bin.
Now, simply copy quartz-wm from the bin folder in the Archive folder to the bin folder inside Crossover. Start up Crossover, and things should look a bit better! You can then get rid of the X11 installer.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20070124205114521