While looking at mobile applications I came across Keeper from Callpod. You can see them on the Microsoft Mobile Marketplace at this location - http://marketplace.windowsphone.com/search.aspx?keywords=keeper
Here is the description::
Keeper is the most downloaded Password Security App with over 1 million trusted users worldwide. CNET editors award it 4½ stars out of 5 while acclaiming Keeper has a "intuitive interface and strong encryption...sleek & well-organized". Approved by the U.S. Military and Department of Homeland Security, Keeper is the most secure and feature-rich password security and storage system on Windows Mobile®. Without question, Keeper is the absolute best value. HIGHLIGHTS ***** CNET Download.com 4.5 / 5.0 Editors Pick 4.5 User Rating - Over 1 Million Trusted Users - Available In 9 Languages Satisfied Users in 60+ Countries - A Safe, Secure and Feature-Rich Experience - CNET Review "intuitive interface and strong encryption...sleek & well-organized" - Wireless Sync to Mac, PC, Linux Laptop/Desktop Computer separate below FEATURES AND BENEFITS - U.S. Government Approved 128-Bit AES Cipher Grade Encryption - Unlimited Number of Records - Data Import and Export - Fully Managed, Secure, Off-Site Backup - Customizable Visual Themes and Colors - Multiple Viewing Modes - Dynamic Search Functions For Quick-Find - Customizable Folders i.e. Personal, Business, Family, etc. LAPTOP & DESKTOP SYNC OPTION separate purchase - Seamlessly Sync Mac, PC, or Linux Laptop/Desktop Computer At Home and Work - Conveniently Allows Activation For Two Computers PROTECT YOUR IDENTITY! YOUR INFO IS PRICELESS. - Eliminate scraps of paper and computer files that can fall into the wrong hands! - Safeguard your master password. We never have access to or knowledge of it. - In the event you lose or forget your master password, even our responsive customer support team will not be able to help you access your info!
We all have to keep track of way too many passwords therefore this application is an essential program.If you have a Windows Mobile 6.5 device then you will be able to find keeper by launching the Marketplace app then searching for Keeper.
If you have a Windows Mobile 6.0 or 6.1 device you can download the marketplace application by going to this link - http://mp.windowsphone.com
You can read more about these versions at this blog - http://windowsteamblog.com/windows_phone/b/windowsphone/archive/2009/11/16/windows-marketplace-for-windows-mobile-6-0-and-6-1.aspx
Hopefully in the near future we will see a Windows Phone 7 version of this application but right now keeping passwords secure is critical so I will be installing. Oh and one cool thing you may not know about our Mobile Marketplace - we actually let you choose whether to pay by credit card or be billed by your network provider.