I would be curious what pg thinks of these documents.
http://ycombinator.com/seriesaa.html
The Series AA documents are intended for angel rounds, whereas it sounds like the Series Seed documents, despite the name, are intended to be used with VCs. It could be harder to talk VCs into using standardized documents, but it would be great if that happened.
I anticipate that both docs (YC + Andreessen/Horowitz are very similar. They keep it simple so that shit doesnt get complicated if you make it to an A round.
What's great is that lots of top notch folks have pledged to use them = a standard is upon us.