Looking at the CUPS howto, I see a pretty good description of how to download and install CUPS. (Thanks, Pete!)
A couple of things are lacking. First, about shopping for a printer. The method today is to buy a printer based on what the vendor would most like to sell, then try it on Cups, and if that doesn't work, then abandon eCS and use some operating system that supports printers.
A better solution would be to collect the list of printers that Cups supports, and present it pretty clearly so you can see the supported printers. To test the list, take a Sunday newspaper, and check Cups support for each printer that you find.
Second, about apps support. Show configuring and using Cups support for Open Office, Firefox and PMView (feel free to substitute apps that you use). Especially show printing on an envelope or other non-standard form. I'm finding that printer support is actually better than back in the IBM supported days, but you have to do a lot of tinkering, research and waste a bit of paper to get there.
A Warpstock attendee asked me if we could have a presentation about hand editing PPD files. If that's what it takes, I'd like to see that described. My printer works because I edited the PPD file to take out unsupported characters / languages.