airhostess: "Is this something that is normal practice waiting for the cord to stop pulsating before clamping or is this something I need to request? "
Standard practice in the UK is to give an injection of syntocinon (synthetic oxytocin) or synotmetrine (synotcinon combined with ergometrine) as soon as the baby is delivered, sometimes as soon as the head is delivered, to encourage the uterus to contract down and the cervix to close. This is thought to help reduce the risk of PPH (although the jury seems to be out, especially if there are no risk factors relevant to this aspect). It is then standard to clamp the cord as soon as the baby is delivered. This is why the cell storage companies get away with lines such as "why not save this precious resource, which would otherwise be thrown away" - standard practice does just that. Whether or not standard practice is still best practice is much more debatable.
If you decide to have either a completely physiological 3rd stage (where you let nature take its course - do read up on the finer points as some MW's have had very little experience, which can lead to mismanagement) then I would make sure your birth partner is VERY clear on the fact, that you make it equally clear to all the MWs and that you write it in big letters on your birth plan.
You can start with a physiological 3rd stage and move to active management (injection, etc) at any point should the MWs see a need (again, you might want to read up on what YOU would see as a "need" - some MWs consider 10 minutes too long to wait for a placenta, just because that's how things tend to pan out with active management, but without the jab there's a lot less time pressure and an hour is not uncommon) or you get fed up of waiting.
I would dearly love to see more research done into the impact of allowing all the cord blood into the baby - but I suspect its unlikely to happen as who will fund it? I do find it frustrating that cell storage firms use such emotive language - if they're that convinced of the worth of this, why do they need to use emotional blackmail?