Well I am sat in the departure lounge of Aberdeen Scotland Airport after a really interesting and enjoyable Customer Engagement around all things Active Directory. Aberdeen has enjoyed some lovely Spring Weather,while I have been there and is very pretty in the Sunshine. Anyway I have also been doing some studying and deeper research around a great new feature in Windows 2008 Branch Office Deployment, specifically Read Only Domain Controllers. So I thought I would put together a Tick List of considerations you should reference to ascertain whether your particular Branch office would satisfy the criteria for deployment. This is not an exhaustive list but is a good starting point. I recommend downloading the step by step guide on RODC servers for an in depth guide.
Plus also read a great entry from this blog, and also this interview with Gregoire Gutat Program Manager Microsoft plus this RODC FAQ
Tick List for RODC Deployment
See TechNet articles on RODC compatibility
Applications That Are Known to Work with RODC
Application Compatibility with RODC
Testing Application Compatibility with RODC
Requires Windows XP, Vista, Windows Server 2000 or later