Thanks
Not on the Xoom itself, at least not yet. The way to do it is to setup your bookmarks on the desktop version of the Google Chrome browser, then sync them to the Xoom using the sync option in the Chrome settings and on the Xoom.
That's great for organizing, but unfortunately doesn't accomplish sorting. Your folders and links are initially displayed in the order they were created. I haven't yet seen if the display order will follow what I've observed on my Droid, where bookmarks over time are displayed in the order they are most frequently accessed.You can make folders within your bookmarks.
Click the star like your making a bookmark. Then select "other folders" under the "add to" line. There you will be able to make a new folder.
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-kesnik
Try bookmarkSB from the market