Lifehacker published an excellent post on How to Use Dropbox as the Ultimate Password Syncer and 1Password received an honorable mention.
The Agile Keychain format recently added to 1Password is perfect for syncing. Every entry is stored in a separate file and that solves the problem of conflicts. Also, 1Password automatically detects changes that were made and reloads the data when needed. It means that you can make changes on multiple computers at the same time.
Here is what Adam Pash from lifehacker says about this new feature:
I'm going to detail how this works with the open-source password manager, KeePass, and with the Mac-only manager, 1Password—the top two favorites in our recent Hive Five Best Password Managers.
1Password works like a charm with Dropbox, since this password manager automatically detects any changes and updates your keychain the moment a change is made to the Agile Keychain file. That means you're much less likely to end up with any sort of conflicts or lost information.