Portable Apps update checker

I find this portable app concept incredibly useful. I work in a computer test lab, so I have my desk PC's, home PC's, and hundreds of test PC's in a lab that I use. Being able to take my applications with me and use them rather than downloading, setting them up, and then using them in each location is awesome. I have only one complaint; I never know if I'm up to date.

Here's my idea, have the portableapps menu (either on startup, or on demand via a menu option) check for application updates. Have it keep a list of what apps are installed, and what revision they are. If there's a newer revision, let me know so I can update, or just update it! I now have to go out once a month and see what rev of each app I have, then check it against the web page to make sure I'm current.