Here is a tutorial from Brandon's Geocaching Blog, Geocacheville, that some may find useful (make sure you view maximized, full page):
Caches Along a Route
I've got a Dell Axim X5 Pocket PC ($100 off eBay) outfitted with a Holux 271 CF GPS Card ($55 off eBay) and I have loaded BeelineGPS on it and I can do everything on it... currently I have over 2,000 waypoints loaded...I can track and manage all my Geocaching activity and I am totally paperless...it's awesome!
See link... http://www.visualgps.net/BeeLineGPS/