Bookmark sync now available in Google Chrome dev channel
If you're running it already, just head to the wrench menu and click about. Once Chrome checks for and finds the update, install it and you're ready to sync. You'll still need to append --enable-sync to your shortcut for the option to appear when you restart. Once you sign in with your Google account, Chrome will keep syncing unless you go to your Personal Stuff options and tell it to take five.
Don't check your Google Bookmarks for your links. They'll actually be synced to a folder in your Google Docs unsurprisingly labeled Google Chrome.
Run a sync from a second (or third or seventeenth) computer and Chrome will prompt you to merge and sync or cancel. It's a nice step, since it gives you time to clean up your bookmarks before committing them to your Google docs store.
Since the Chrome dev page is still pushing v 18.104.22.168 for Linux, you won't be able to use sync just yet. The updated build is likely not far behind (if you've got it working in your distro, please tell us in the comments - I had no luck with Chrome or with Chromium via Launchpad).
For those of you who want to make the switch to the dev channel now to give sync a try, you can download it from this Google page or use the Chrome Channel Changer to switch the build the built-in updater checks.