>>In addition, GPS saves a breadcrumb trail of your ride so that you will be able to find that fantastic overlook again, or that really nice ________ for sale (fill in the blank).<<
Not all GPS have breadcrumb. I've been looking at a shitload of them in the last few days. I found one at the low end that has it it, a Caliber P-3600. It's ~$250. Nice unit, but no text t-to-speech. Not a big deal, but TTS is nice to have.
The Magellan RoadMate 2200T is ~$400 with TTS and breadcrumb. Both also play MP3s and allow you to view images.
Two of the coolest units I've seen are the Navman N40i and N60i for ~$400&$500. These buggers have a 1.3MP camera that embed the NAV data into the image. Then all you have to do is look though an image database, load the image and the coordinates are set into the GPS. Awesome. The Navman webite has user-uploaded images, and they've partnered with travel service Lonely Planet, who've embedded NAV data to their images. Needless to say, this is a great way to plan a trip somewhere, just look for some place you want to ride to, download the image, and set your route. Totally cool. Unfortunately I don't think these units have breadcrumb, but the camera partially compensates for it.
RDUBandit, the way to use a GPS on a bike is to hook up to the audio. Use the audio instructions to navigate. Absolutely don't look at the map unless you're doing a quick glace. I agree that getting lost is fun, but when fuel starts running low, you want to start finding your way. Another great feature of GPS units is that they'll let you know where to find the nearest gas station There's definitely a GPS in my (near) future. Check 'em out:
Navman:
http://tinyurl.com/yj6sytCaliber:
http://www.calibergps.com/Magellen:
http://tinyurl.com/yakvly