Need to sync bookmarks across multiple platforms and/or different browsers? You need Xmarks.
The service that was on its way out, then bought by LastPass, allows you to sync bookmarks to the cloud, between machines and between different browsers. Xmarks has extensions or plugins for Safari (installed as a preference pane), Chrome, Firefox and even Internet Explorer, so it's got most mainstream browsers covered.
Xmarks will sync your bookmarks to the cloud and give you access to them through the my.xmarks.com if you're somewhere without the Xmarks plugin installed. You can keep different profiles, one for work and one for home perhaps, and you can share your bookmarks with friends via RSS or the Xmarks site, all for the fantastic price of free.
It's true that Safari, Firefox and Chrome will all sync your bookmarks from one computer to another, but not between different browsers. Xmarks lets you use Chrome on one machine and Safari on another. It'll even let you sync your Chrome bookmarks to your iDevice through iTunes courtesy of a little Safari syncing intermediary.
Speaking of iOS, if you want access to your bookmarks through the Xmarks app on iOS, Android or Blackberry, Xmarks Premium at a yearly charge of $12 nets you that plus backup and restore for your bookmarks. Xmarks Premium also comes with open tab sync, so you can take your browsing sessions from machine to machine, browser to browser.
If you've ever wanted to sync your bookmarks between different browsers, the free Xmarks makes it quick and easy. Download Xmarks for your browser from here to get started.