Huh. I was actually looking for a Chrome bookmark sync for my iPhone two or three weeks ago and I came across Xmarks. I didn't choose it because I was really hoping for a standalone app that would interface with Chrome's built-in bookmark sync. While it's sad to see any popular software company shutter its doors, since it is going away (in a comparatively short 90 days, no less) I'm personally glad I didn't start using it.