Chrome killed my use of Xmarks. With a consistent, cross-platform browser that has syncing out-of-the-box I no longer need Xmarks. I mainly use other browsers for testing now.
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The nice thing is that I can "bookmark" any link from any browser that I use, as well as twitter and RSS. And I have them instantly on my iPad, phone, notebook, or any machine with a browser without installing any software or extensions.