The answer so far is that EVERYBODY gets a /48, but if you think that there is a risk that you won't be able to get additional /32s when you outgrow your first allocation, then give a /56 to RESIDENTIAL SITES. This is not the same as dialup, i.e. residential sites could be connected with DSL, T1s, wireless, or whatever. In fact, if a business is connected via dialup, you should give them a /48, because businesses have a habit of continuous growth, unlike residences which tend to top out at 5 or 6 residents.
We will probably disagree about this one. I will probably give out /48 to residential broadband when we expand IPv6 to residential. But dialup users typically have zero networks; not even the single LAN of res broadband.
I'm not talking about old folks hanging on to their 386 running Windows 3.1. There is a vast expanse of real estate known as rural America that is unlikely to get broadband anytime soon due to the large distance from the exchange. But these residential sites are often also family businesses with a network in the barn, one in the feed silo, etc., etc. They deserve to be assigned an IPv6 allocation under the same terms as urban sites, i.e. a /48. Admittedly there are issues in getting IPv6 access to these folks but in a world in which there aren't enough free IPv4 addresses, it is still doable using an IPv4 island containing their modem gateway, your terminal server and your IPv6 tunnel broker. Because it's an IPv4 island you can hijack any old IPv4 addresses and nobody will notice. And using IPv4 for transport avoids the need to upgrade PPP and terminal servers to support IPv6. Those old IPv4 terminal servers aren't likely to wear out anytime soon.
Not that changing "all" of our IPv6 dialup users would take more than a couple of calls :). Talk about a narrow niche.
For a rural ISP, it might be the core of their business. One size does not fit all. There is still room for good old-fashioned hackery in making an IPv6 Internet functional, just like the early days of the commercial Internet when people were building terminal servers out of Linux boxes, and hacking things like PoP before SMTP to glue things together. --Michael Dillon