If you need to replace every instance of a particular file inside a directory structure (e.g., distribute a set of bookmarks to every user's home directory), you can use my File Distributor application. You put in the path to the file that you want to use as a replacement, the name of the file that you want replaced, and the path to the folder where you want to start the replacement process. You can do this by typing it in, drag and drop, or selecting from a standard file dialog. Grab it from http://ps-enable.com/software/FileDistributor1.0.dmg
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Cool! I also wrote something similar to this in response to a forum post.
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“The future is here. It’s just not evenly distributed yet.” –William Gibson