I use mSecure it can keep memo's & passwords and is password protected. It's $5.00 for your handset and $15 for the desktop if you want the desktop feature.
The nice thing with it is that it syncs with your desktop over wi-fi.
Also, you can set it to wipe your passwords on your phone should someone input the password incorrectly x amount of time (you can decide how many times). I have been using it for a month now and I couldn't do without it.