Bookmark syncing is something longtime Chrome users are going to love. Since iOS doesn’t let users set a default browser (or default app for anything), it’s going to be an awkward experience on iOS. This will probably increase the number of requests for this feature. Why not let Sparrow be the default email app, if the user so chooses, or Chrome be the default browser?
Update: The best feature of Chrome for iOS, by far, is a menu option to request the desktop site, rather than a crappy mobile site. Nice.