Xmarks (formerly known as Foxmarks) is possibly my favorite Firefox add-on and the release of Xmarks for Safari has removed one of the major barriers that was preventing me switching to Apple's elegant Safari browser.
If you've never used it, Xmarks is a free add-on for your browser that syncs and backs up your bookmarks across multiple computers and more. The result is that wherever you have Safari, you have your bookmarks with you at any time. What's more, you never need to worry about losing your bookmarks again because Xmarks always holds a backup of them on its servers.
If you've already signed-up for Xmarks using Firefox then you're already half way there. If not, you'll need to sign-up which you do before or during installation. Create a username, enter a password and within less than 30 seconds, all of your bookmarks will appear in Safari. There's a small Xmarks icon in your menu bar which allows you to synchronize Xmarks at any time and see your bookmarks on the Xmarks server.
The only downside of Xmarks for Safari is that, as with the Firefox version, the browser is prone to slowing down when bookmarks are syncing. It's effect on the stability of Safari is also dubious although it's hard to say whether it's responsible for any crashes.
Xmarks for Safari is an absolute essential for anyone who regularly relies on their bookmarks on the move.