For those (like myself) who may not know/remember the model numbers to all their old Sprint phones, I have found what claims to be a complete list of old, discontinued Sprint phones: http://www.tmiwireless.com/old-sprint-phones.html
Even if it turns out not to be a complete list, it's still kind of fun to look at the old stuff and see how far mobile phones have come within the last 5-10 years.