Hi All!
Just wanted to post our first attempt at making our free driver updater portable:
http://www.devicedoctor.com/device-doctor-portable.php
It scans any computer for updated drivers and will download the ones you want from our fast servers. It's completely free with no adware.
We haven't done a portable version before but I hope it's good enough to be added to PortableApps.
Thanks,
Collin