As some of you may now, localization architcture is one of the subject areas that I have always enjoyed. THough I am in the midst of my WCF book, a few months ago I did wrap up a whitepaper for MSDN on the subject of custom resource providers and custom localization expressions. I also learned a lot in the process, with some great feedback from the product team, specifically Simon Calvert and Eilon Lipton, who pointed me in the right direction for how things work under the covers. In this article you'll learn about custom resource managers, storing resources in the database, accessing resources from external assemblies instead of using the App_GlobalResources directory, and creating custom localization expressions to tie it all together. I hope you enjoy this!

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/ExASPNET20RPM.asp

I'll be writing two follow up whitepapers in this series, a little later this year when I wrap up my book. The subject will be hooking the IDE to help you with your localization dev process and creating complex culture hierarchies that are customizable for personalization. Stay tuned!