With the Heartbleed bug and other hacking going on these days, a good password application is almost a necessity.
I first tried 1Password a couple of years ago and I still use it on a daily basis. It syncs seamlessly between my Mac and my iOS devices. When the Heartbleed bug hit, I was able to change my passwords pretty easily using 1Password.
The Mac versions and the iOS version were both updated today and the app is on sale for half-price for a short time - through Friday April 25th. They also have versions for Android and Windows.
I highly recommend that you check it out!
Updated 4/24/2014: Courtesy of Mac Powers Users, I found a great free screencast through Screencasts Online on 1Password (Mac version)! Take a look for some great training on this app!
1Password - Official Site