Sky Wallet is very good, you can save encrypted data to skydrive and it has a desktop app. E wallet go is popular on several platforms and pretty good too.
SkyWallet ftw. It syncs with SkyDrive and as mentioned, has a desktop companion that also syncs w/SkyDrive. The desktop app also has an import utility for many popular password apps, or via CSV file.
Personally I have always used KeePass on my desktops. There is an app in the marketplace thats called 7Pass that allows you to sync your KeePass files from skydrive or dropbox.
I am sure SkyWallet is easier to manager with a WP7 device but I already know KeePass and use it. Plus I got the paid 7Pass app so I want to use it