Some docs that may help:

- RDS Architecture Summary: http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=9bc943b7-07c5-4335-9df9-20e77ed5032e

- Virtualized RDSH guide (including costing): http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=8d454921-72d6-45b4-b6ba-ac1c26d337bd

- Host Capacity planning  http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=bd24503e-b8b7-4b5b-9a86-af03ac5332c8

- Another deployment guide (not the IPD) : http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=1d95a910-72a5-44ec-96db-6853f6f9dc5b

 

more doc will come from vendors like HP, Dell,…