Bluebearee-
I hiked it in 2002 and updated the Data Book campsite and water data for the CTF (which was also used in the guidebook). I carried the guideboook (in sections), the data book, a GPS unit (for gathering waypoints for the new Data Book edition) and the CDROM maps. There were some confusing spots, but we always figured them out. I even marked them via GPS for the CTF, but I can't remember if they included those in the data book or the guidebook.
Just so you know, there ae many great campsites not listed in the data book. We identified and rated every watersource, but it was so dry we missed many “seasonal” flows; however, everthing we DID get was considered reliable.
I think taking the guidebook (cut into sections) and the maps would be fine. Bring a lightwieght compass.
Advise for the maps: This is a great way to do this! You can go under print options in the program and print two to a page, which is four to a sheet. Get some waterproof paper (10-20 bucks; I think the CTF still sells it for the maps so your money goes back to the trail) and make the print size a quarter-page (3x5 inches; if you can see that small of print) and print it in color (to see water and topo lines). You can cut the maps out, get them in order (make sure you mark them A1, A2, A3, ect right as you print them so you don’t make a mess) and then stack them up in little sections that you will mail yourself. Each stack gets a staple on the top and there you are with your very own color waterproof map flipbook that can fit in your back pocket. It was so useful, I hardly ever referenced the guide book (but still found it necessary), and never had to stop to pull maps out.
The Colorado trail is not as well marked as the CDT in Colorado, so be wise and aware. Have a good time -the wildflowers are breathtaking!
Tha Wookie