BookMacster is able to import bookmarks from and export bookmarks to a user account on another Mac. Now first let us say that if you have two Macs, and you want all of your data, including documents, music, pictures etc. synced as well as bookmarks, there are ways to do that which will bring your bookmarks along for the ride.
However, for one-time operations, or if bookmarks is all you're interested in, you can set up an Other Macintosh Account type of Client in any Bookmarkshelf.
Here's how it works. This movie runs 2:13, 744x576 pixels, 6.5 MB. Produced 2011-06-24 with BookMacster version 1.5.8.