40XXX PRL were nice about a year ago, they were the first series to allow roaming on sprint EVDO, and maybe they are still the only ones that still do. But I know back in 2007 the big deal about the 40XXX was it allowed for spring EVDO on data cards. And they were mainly used for data cards.
for a list of all PRL files see this site.
http://corolada.com/prl/