Fellow FriendsInTech.com & TechPodcast.com podcaster Mike @ The Mike Tech Show did a podcast back on Sep. 24, 2005 entitled "The Ultimate Portable Utilities for a USB Key."  It is a really good resource for many of us playing with customized USB applications.

Several Tech Tidbits Daily podcasts from Nov/Oct covered similar topics: #1, #2, #3, and #4.